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 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
194 CROSS_COMPILE ?= arm-linux-
195 #CROSS_COMPILE ?= arm-wiz-linux-gnueabi-
197 # Architecture as present in compile.h
198 UTS_MACHINE := $(ARCH)
201 # Additional ARCH settings for x86
205 ifeq ($(ARCH),x86_64)
209 KCONFIG_CONFIG ?= .config
211 # SHELL used by kbuild
212 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
213 else if [ -x /bin/bash ]; then echo /bin/bash; \
214 else echo sh; fi ; fi)
218 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
221 # Decide whether to build built-in, modular, or both.
222 # Normally, just do built-in.
227 # If we have only "make modules", don't compile built-in objects.
228 # When we're building modules with modversions, we need to consider
229 # the built-in objects during the descend as well, in order to
230 # make sure the checksums are up to date before we record them.
232 ifeq ($(MAKECMDGOALS),modules)
233 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
236 # If we have "make <whatever> modules", compile modules
237 # in addition to whatever we do anyway.
238 # Just "make" or "make all" shall build modules as well
240 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
244 ifeq ($(MAKECMDGOALS),)
248 export KBUILD_MODULES KBUILD_BUILTIN
249 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
252 # ---------------------------------------------------------------------------
254 # Normally, we echo the whole command before executing it. By making
255 # that echo $($(quiet)$(cmd)), we now have the possibility to set
256 # $(quiet) to choose other forms of output instead, e.g.
258 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
259 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
261 # If $(quiet) is empty, the whole command will be printed.
262 # If it is set to "quiet_", only the short version will be printed.
263 # If it is set to "silent_", nothing will be printed at all, since
264 # the variable $(silent_cmd_cc_o_c) doesn't exist.
266 # A simple variant is to prefix commands with $(Q) - that's useful
267 # for commands that shall be hidden in non-verbose mode.
271 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
272 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
274 ifeq ($(KBUILD_VERBOSE),1)
282 # If the user is running make -s (silent mode), suppress echoing of
285 ifneq ($(findstring s,$(MAKEFLAGS)),)
289 export quiet Q KBUILD_VERBOSE
292 # Look for make include files relative to root of kernel src
293 MAKEFLAGS += --include-dir=$(srctree)
295 # We need some generic definitions (do not try to remake the file).
296 $(srctree)/scripts/Kbuild.include: ;
297 include $(srctree)/scripts/Kbuild.include
299 # Make variables (CC, etc...)
301 AS = $(CROSS_COMPILE)as
302 LD = $(CROSS_COMPILE)ld
303 CC = $(CROSS_COMPILE)gcc
305 AR = $(CROSS_COMPILE)ar
306 NM = $(CROSS_COMPILE)nm
307 STRIP = $(CROSS_COMPILE)strip
308 OBJCOPY = $(CROSS_COMPILE)objcopy
309 OBJDUMP = $(CROSS_COMPILE)objdump
311 GENKSYMS = scripts/genksyms/genksyms
312 DEPMOD = /sbin/depmod
313 KALLSYMS = scripts/kallsyms
317 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
319 CFLAGS_MODULE = $(MODFLAGS)
320 AFLAGS_MODULE = $(MODFLAGS)
322 ifeq ("$(CROSS_COMPILE)", "arm-wiz-linux-gnueabi-")
323 CFLAGS_KERNEL = -fno-tree-scev-cprop
325 ifeq ("$(CROSS_COMPILE)", "arm-linux-")
331 # Use LINUXINCLUDE when you must reference the include/ directory.
332 # Needed to be compatible with the O= option
333 LINUXINCLUDE := -Iinclude \
334 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
335 -include include/linux/autoconf.h
337 KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
339 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
340 -fno-strict-aliasing -fno-common \
341 -Werror-implicit-function-declaration
342 KBUILD_AFLAGS := -D__ASSEMBLY__
344 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
345 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
346 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
348 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
349 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
350 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
351 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
353 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
354 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
355 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
357 # When compiling out-of-tree modules, put MODVERDIR in the module
358 # tree rather than in the kernel tree. The kernel tree might
360 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
362 # Files to ignore in find ... statements
364 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
365 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
367 # ===========================================================================
368 # Rules shared between *config targets and build targets
370 # Basic helpers built in scripts/
371 PHONY += scripts_basic
373 $(Q)$(MAKE) $(build)=scripts/basic
375 # To avoid any implicit rule to kick in, define an empty command.
376 scripts/basic/%: scripts_basic ;
378 PHONY += outputmakefile
379 # outputmakefile generates a Makefile in the output directory, if using a
380 # separate output directory. This allows convenient use of make in the
383 ifneq ($(KBUILD_SRC),)
384 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
385 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
388 # To make sure we do not include .config for any of the *config targets
389 # catch them early, and hand them over to scripts/kconfig/Makefile
390 # It is allowed to specify more targets when calling make, including
391 # mixing *config targets and build targets.
392 # For example 'make oldconfig all'.
393 # Detect when mixed targets is specified, and make a second invocation
394 # of make so .config is not included in this case either (for *config).
396 no-dot-config-targets := clean mrproper distclean \
397 cscope TAGS tags help %docs check% \
398 include/linux/version.h headers_% \
399 kernelrelease kernelversion
405 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
406 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
411 ifeq ($(KBUILD_EXTMOD),)
412 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
414 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
420 ifeq ($(mixed-targets),1)
421 # ===========================================================================
422 # We're called with mixed targets (*config and build targets).
423 # Handle them one by one.
426 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
429 ifeq ($(config-targets),1)
430 # ===========================================================================
431 # *config targets only - make sure prerequisites are updated, and descend
432 # in scripts/kconfig to make the *config target
434 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
435 # KBUILD_DEFCONFIG may point out an alternative default configuration
436 # used for 'make defconfig'
437 include $(srctree)/arch/$(SRCARCH)/Makefile
438 export KBUILD_DEFCONFIG
440 config %config: scripts_basic outputmakefile FORCE
441 $(Q)mkdir -p include/linux include/config
442 $(Q)$(MAKE) $(build)=scripts/kconfig $@
445 # ===========================================================================
446 # Build targets only - this includes vmlinux, arch specific targets, clean
447 # targets and others. In general all targets except *config targets.
449 ifeq ($(KBUILD_EXTMOD),)
450 # Additional helpers built in scripts/
451 # Carefully list dependencies so we do not try to build scripts twice
454 scripts: scripts_basic include/config/auto.conf
455 $(Q)$(MAKE) $(build)=$(@)
457 # Objects we will link into vmlinux / subdirs we need to visit
459 drivers-y := drivers/ sound/
463 endif # KBUILD_EXTMOD
465 ifeq ($(dot-config),1)
467 -include include/config/auto.conf
469 ifeq ($(KBUILD_EXTMOD),)
470 # Read in dependencies to all Kconfig* files, make sure to run
471 # oldconfig if changes are detected.
472 -include include/config/auto.conf.cmd
474 # To avoid any implicit rule to kick in, define an empty command
475 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
477 # If .config is newer than include/config/auto.conf, someone tinkered
478 # with it and forgot to run make oldconfig.
479 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
480 # we execute the config step to be sure to catch updated Kconfig files
481 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
482 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
484 # external modules needs include/linux/autoconf.h and include/config/auto.conf
485 # but do not care if they are up-to-date. Use auto.conf to trigger the test
486 PHONY += include/config/auto.conf
488 include/config/auto.conf:
489 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
491 echo " ERROR: Kernel configuration is invalid."; \
492 echo " include/linux/autoconf.h or $@ are missing."; \
493 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
497 endif # KBUILD_EXTMOD
500 # Dummy target needed, because used as prerequisite
501 include/config/auto.conf: ;
502 endif # $(dot-config)
504 # The all: target is the default when no target is given on the
506 # This allow a user to issue only 'make' to build a kernel including modules
507 # Defaults vmlinux but it is usually overridden in the arch makefile
510 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
516 include $(srctree)/arch/$(SRCARCH)/Makefile
518 ifdef CONFIG_FRAME_POINTER
519 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
521 KBUILD_CFLAGS += -fomit-frame-pointer
524 ifdef CONFIG_DEBUG_INFO
526 KBUILD_AFLAGS += -gdwarf-2
529 # Force gcc to behave correct even for buggy distributions
530 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
532 # arch Makefile may override CC so keep this after arch Makefile is included
533 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
534 CHECKFLAGS += $(NOSTDINC_FLAGS)
536 # warn about C99 declaration after statement
537 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
539 # disable pointer signed / unsigned warnings in gcc 4.0
540 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
542 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
543 # But warn user when we do so
545 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
547 ifneq ($(KCPPFLAGS),)
548 $(call warn-assign,CPPFLAGS)
549 KBUILD_CPPFLAGS += $(KCPPFLAGS)
552 $(call warn-assign,AFLAGS)
553 KBUILD_AFLAGS += $(KAFLAGS)
556 $(call warn-assign,CFLAGS)
557 KBUILD_CFLAGS += $(KCFLAGS)
560 # Use --build-id when available.
561 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
562 $(call ld-option, -Wl$(comma)--build-id,))
563 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
564 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
566 # Default kernel image to build when no specific target is given.
567 # KBUILD_IMAGE may be overruled on the command line or
568 # set in the environment
569 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
571 export KBUILD_IMAGE ?= vmlinux
574 # INSTALL_PATH specifies where to place the updated kernel and system map
575 # images. Default is /boot, but you can set it to other values
576 export INSTALL_PATH ?= /boot
579 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
580 # relocations required by build roots. This is not defined in the
581 # makefile but the argument can be passed to make if needed.
584 INSTALL_MOD_PATH := $(shell \
585 if [ -f .insignal_module_installdir ]; then \
586 echo -n "`cat .insignal_module_installdir`"; \
589 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
593 # INSTALL_MOD_STRIP, if defined, will cause modules to be
594 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
595 # the default option --strip-debug will be used. Otherwise,
596 # INSTALL_MOD_STRIP will used as the options to the strip command.
598 ifdef INSTALL_MOD_STRIP
599 ifeq ($(INSTALL_MOD_STRIP),1)
600 mod_strip_cmd = $(STRIP) --strip-debug
602 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
603 endif # INSTALL_MOD_STRIP=1
606 endif # INSTALL_MOD_STRIP
610 ifeq ($(KBUILD_EXTMOD),)
611 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
613 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
614 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
615 $(net-y) $(net-m) $(libs-y) $(libs-m)))
617 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
619 $(core-n) $(core-) $(drivers-n) $(drivers-) \
620 $(net-n) $(net-) $(libs-n) $(libs-))))
622 init-y := $(patsubst %/, %/built-in.o, $(init-y))
623 core-y := $(patsubst %/, %/built-in.o, $(core-y))
624 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
625 net-y := $(patsubst %/, %/built-in.o, $(net-y))
626 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
627 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
628 libs-y := $(libs-y1) $(libs-y2)
631 # ---------------------------------------------------------------------------
632 # vmlinux is built from the objects selected by $(vmlinux-init) and
633 # $(vmlinux-main). Most are built-in.o files from top-level directories
634 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
635 # Ordering when linking is important, and $(vmlinux-init) must be first.
640 # +-< $(vmlinux-init)
641 # | +--< init/version.o + more
643 # +--< $(vmlinux-main)
644 # | +--< driver/built-in.o mm/built-in.o + more
646 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
648 # vmlinux version (uname -v) cannot be updated during normal
649 # descending-into-subdirs phase since we do not yet know if we need to
651 # Therefore this step is delayed until just before final link of vmlinux -
652 # except in the kallsyms case where it is done just before adding the
653 # symbols to the kernel.
655 # System.map is generated to document addresses of all kernel symbols
657 vmlinux-init := $(head-y) $(init-y)
658 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
659 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
660 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
661 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
663 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
664 # May be overridden by arch/$(ARCH)/Makefile
665 quiet_cmd_vmlinux__ ?= LD $@
666 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
667 -T $(vmlinux-lds) $(vmlinux-init) \
668 --start-group $(vmlinux-main) --end-group \
669 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
671 # Generate new vmlinux version
672 quiet_cmd_vmlinux_version = GEN .version
673 cmd_vmlinux_version = set -e; \
674 if [ ! -r .version ]; then \
678 mv .version .old_version; \
679 expr 0$$(cat .old_version) + 1 >.version; \
681 $(MAKE) $(build)=init
683 # Generate System.map
684 quiet_cmd_sysmap = SYSMAP
685 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
688 # If CONFIG_KALLSYMS is set .version is already updated
689 # Generate System.map and verify that the content is consistent
690 # Use + in front of the vmlinux_version rule to silent warning with make -j2
691 # First command is ':' to allow us to use + in front of the rule
692 define rule_vmlinux__
694 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
696 $(call cmd,vmlinux__)
697 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
699 $(Q)$(if $($(quiet)cmd_sysmap), \
700 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
701 $(cmd_sysmap) $@ System.map; \
702 if [ $$? -ne 0 ]; then \
710 ifdef CONFIG_KALLSYMS
711 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
712 # It's a three stage process:
713 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
715 # Running kallsyms on that gives us .tmp_kallsyms1.o with
716 # the right size - vmlinux version (uname -v) is updated during this step
717 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
718 # but due to the added section, some addresses have shifted.
719 # From here, we generate a correct .tmp_kallsyms2.o
720 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
721 # o Verify that the System.map from vmlinux matches the map from
722 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
723 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
724 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
725 # temporary bypass to allow the kernel to be built while the
726 # maintainers work out what went wrong with kallsyms.
728 ifdef CONFIG_KALLSYMS_EXTRA_PASS
734 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
736 define verify_kallsyms
737 $(Q)$(if $($(quiet)cmd_sysmap), \
738 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
739 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
740 $(Q)cmp -s System.map .tmp_System.map || \
741 (echo Inconsistent kallsyms data; \
742 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
743 rm .tmp_kallsyms* ; /bin/false )
746 # Update vmlinux version before link
747 # Use + in front of this rule to silent warning about make -j1
748 # First command is ':' to allow us to use + in front of this rule
749 cmd_ksym_ld = $(cmd_vmlinux__)
752 +$(call cmd,vmlinux_version)
753 $(call cmd,vmlinux__)
754 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
757 # Generate .S file with all kernel symbols
758 quiet_cmd_kallsyms = KSYM $@
759 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
760 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
762 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
763 $(call if_changed_dep,as_o_S)
765 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
768 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
769 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
770 $(call if_changed_rule,ksym_ld)
772 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
773 $(call if_changed,vmlinux__)
775 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
776 $(call if_changed,vmlinux__)
778 # Needs to visit scripts/ before $(KALLSYMS) can be used.
779 $(KALLSYMS): scripts ;
781 # Generate some data for debugging strange kallsyms problems
782 debug_kallsyms: .tmp_map$(last_kallsyms)
784 .tmp_map%: .tmp_vmlinux% FORCE
785 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
791 endif # ifdef CONFIG_KALLSYMS
793 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
794 # relevant sections renamed as per the linker script.
795 quiet_cmd_vmlinux-modpost = LD $@
796 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
797 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
798 $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
799 define rule_vmlinux-modpost
801 +$(call cmd,vmlinux-modpost)
802 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
803 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
806 # vmlinux image - including updated kernel symbols
807 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE
808 ifdef CONFIG_HEADERS_CHECK
809 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
812 $(Q)$(MAKE) $(build)=samples
814 $(call vmlinux-modpost)
815 $(call if_changed_rule,vmlinux__)
816 $(Q)rm -f .old_version
818 vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
819 $(call if_changed_rule,vmlinux-modpost)
821 # The actual objects are generated when descending,
822 # make sure no implicit rule kicks in
823 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
825 # Handle descending into subdirectories listed in $(vmlinux-dirs)
826 # Preset locale variables to speed up the build process. Limit locale
827 # tweaks to this spot to avoid wrong language settings when running
828 # make menuconfig etc.
829 # Error messages still appears in the original language
831 PHONY += $(vmlinux-dirs)
832 $(vmlinux-dirs): prepare scripts
833 $(Q)$(MAKE) $(build)=$@
835 # Build the kernel release string
837 # The KERNELRELEASE value built here is stored in the file
838 # include/config/kernel.release, and is used when executing several
839 # make targets, such as "make install" or "make modules_install."
841 # The eventual kernel release string consists of the following fields,
842 # shown in a hierarchical format to show how smaller parts are concatenated
843 # to form the larger and final value, with values coming from places like
844 # the Makefile, kernel config options, make command line options and/or
845 # SCM tag information.
849 # $(PATCHLEVEL) eg, 6
851 # $(EXTRAVERSION) eg, -rc6
854 # localversion* (files without backups, containing '~')
855 # $(CONFIG_LOCALVERSION) (from kernel config setting)
856 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
857 # ./scripts/setlocalversion (SCM tag, if one exists)
858 # $(LOCALVERSION) (from make command line if provided)
860 # Note how the final $(localver-auto) string is included *only* if the
861 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
862 # moment, only git is supported but other SCMs can edit the script
863 # scripts/setlocalversion and add the appropriate checks as needed.
865 pattern = ".*/localversion[^~]*"
866 string = $(shell cat /dev/null \
867 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
869 localver = $(subst $(space),, $(string) \
870 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
872 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
873 # and if the SCM is know a tag from the SCM is appended.
874 # The appended tag is determined by the SCM used.
876 # Currently, only git is supported.
877 # Other SCMs can edit scripts/setlocalversion and add the appropriate
879 ifdef CONFIG_LOCALVERSION_AUTO
880 _localver-auto = $(shell $(CONFIG_SHELL) \
881 $(srctree)/scripts/setlocalversion $(srctree))
882 localver-auto = $(LOCALVERSION)$(_localver-auto)
885 localver-full = $(localver)$(localver-auto)
887 # Store (new) KERNELRELASE string in include/config/kernel.release
888 kernelrelease = $(KERNELVERSION)$(localver-full)
889 include/config/kernel.release: include/config/auto.conf FORCE
891 $(Q)echo $(kernelrelease) > $@
894 # Things we need to do before we recursively start building the kernel
895 # or the modules are listed in "prepare".
896 # A multi level approach is used. prepareN is processed before prepareN-1.
897 # archprepare is used in arch Makefiles and when processed asm symlink,
898 # version.h and scripts_basic is processed / created.
900 # Listed in dependency order
901 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
903 # prepare3 is used to check if we are building in a separate output directory,
905 # 1) Check that make has not been executed in the kernel src $(srctree)
906 # 2) Create the include2 directory, used for the second asm symlink
907 prepare3: include/config/kernel.release
908 ifneq ($(KBUILD_SRC),)
909 @echo ' Using $(srctree) as source for kernel'
910 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
911 echo " $(srctree) is not clean, please run 'make mrproper'";\
912 echo " in the '$(srctree)' directory.";\
915 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
916 $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
919 # prepare2 creates a makefile if using a separate output directory
920 prepare2: prepare3 outputmakefile
922 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
923 include/asm include/config/auto.conf
926 archprepare: prepare1 scripts_basic
928 prepare0: archprepare FORCE
929 $(Q)$(MAKE) $(build)=.
930 $(Q)$(MAKE) $(build)=. missing-syscalls
932 # All the preparing..
935 # Leave this as default for preprocessing vmlinux.lds.S, which is now
936 # done in arch/$(ARCH)/kernel/Makefile
938 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
940 # The asm symlink changes when $(ARCH) changes.
941 # Detect this and ask user to run make mrproper
944 $(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`; \
945 if [ -L include/asm ]; then \
946 if [ "$$asmlink" != "$(SRCARCH)" ]; then \
947 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
948 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
952 echo ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
953 if [ ! -d include ]; then \
956 ln -fsn asm-$(SRCARCH) $@; \
959 # Generate some files
960 # ---------------------------------------------------------------------------
962 # KERNELRELEASE can change from a few different places, meaning version.h
963 # needs to be updated, so this check is forced on all builds
966 define filechk_utsrelease.h
967 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
968 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
971 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
974 define filechk_version.h
975 (echo \#define LINUX_VERSION_CODE $(shell \
976 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
977 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
980 include/linux/version.h: $(srctree)/Makefile FORCE
981 $(call filechk,version.h)
983 include/linux/utsrelease.h: include/config/kernel.release FORCE
984 $(call filechk,utsrelease.h)
986 # ---------------------------------------------------------------------------
990 @echo '*** Warning: make $@ is unnecessary now.'
992 # ---------------------------------------------------------------------------
994 INSTALL_HDR_PATH=$(objtree)/usr
995 export INSTALL_HDR_PATH
997 HDRFILTER=generic i386 x86_64
998 HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
1000 PHONY += headers_install_all
1001 headers_install_all: include/linux/version.h scripts_basic FORCE
1002 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1003 $(Q)for arch in $(HDRARCHES); do \
1004 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
1007 PHONY += headers_install
1008 headers_install: include/linux/version.h scripts_basic FORCE
1009 @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1010 echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
1012 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1013 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
1015 PHONY += headers_check_all
1016 headers_check_all: headers_install_all
1017 $(Q)for arch in $(HDRARCHES); do \
1018 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
1021 PHONY += headers_check
1022 headers_check: headers_install
1023 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
1025 # ---------------------------------------------------------------------------
1028 ifdef CONFIG_MODULES
1030 # By default, build modules as well
1037 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1038 @echo ' Building modules, stage 2.';
1039 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1042 # Target to prepare building external modules
1043 PHONY += modules_prepare
1044 modules_prepare: prepare scripts
1046 # Target to install modules
1047 PHONY += modules_install
1048 modules_install: _modinst_ _modinst_post
1052 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1053 echo "Warning: you may need to install module-init-tools"; \
1054 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1057 @rm -rf $(MODLIB)/kernel
1058 @rm -f $(MODLIB)/source
1059 @mkdir -p $(MODLIB)/kernel
1060 @ln -s $(srctree) $(MODLIB)/source
1061 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1062 rm -f $(MODLIB)/build ; \
1063 ln -s $(objtree) $(MODLIB)/build ; \
1065 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1067 # This depmod is only for convenience to give the initial
1068 # boot a modules.dep even before / is mounted read-write. However the
1069 # boot script depmod is the master version.
1070 PHONY += _modinst_post
1071 _modinst_post: _modinst_
1074 else # CONFIG_MODULES
1076 # Modules not configured
1077 # ---------------------------------------------------------------------------
1079 modules modules_install: FORCE
1081 @echo "The present kernel configuration has modules disabled."
1082 @echo "Type 'make config' and enable loadable module support."
1083 @echo "Then build a kernel with module support enabled."
1087 endif # CONFIG_MODULES
1090 # Cleaning is done on three levels.
1091 # make clean Delete most generated files
1092 # Leave enough to build external modules
1093 # make mrproper Delete the current configuration, and all generated files
1094 # make distclean Remove editor backup files, patch leftover files and the like
1096 # Directories & files removed with 'make clean'
1097 CLEAN_DIRS += $(MODVERDIR)
1098 CLEAN_FILES += vmlinux System.map \
1099 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1101 # Directories & files removed with 'make mrproper'
1102 MRPROPER_DIRS += include/config include2 usr/include
1103 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1104 include/linux/autoconf.h include/linux/version.h \
1105 include/linux/utsrelease.h \
1106 Module.symvers tags TAGS cscope*
1108 # clean - Delete most, but leave enough to build external modules
1110 clean: rm-dirs := $(CLEAN_DIRS)
1111 clean: rm-files := $(CLEAN_FILES)
1112 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1114 PHONY += $(clean-dirs) clean archclean
1116 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1118 clean: archclean $(clean-dirs)
1121 @find . $(RCS_FIND_IGNORE) \
1122 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1123 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1124 -o -name '*.symtypes' \) \
1125 -type f -print | xargs rm -f
1127 # mrproper - Delete all generated files, including .config
1129 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1130 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1131 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1133 PHONY += $(mrproper-dirs) mrproper archmrproper
1135 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1137 mrproper: clean archmrproper $(mrproper-dirs)
1146 @find $(srctree) $(RCS_FIND_IGNORE) \
1147 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1148 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1149 -o -name '.*.rej' -o -size 0 \
1150 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1151 -type f -print | xargs rm -f
1154 # Packaging of the kernel to various formats
1155 # ---------------------------------------------------------------------------
1156 # rpm target kept for backward compatibility
1157 package-dir := $(srctree)/scripts/package
1159 %pkg: include/config/kernel.release FORCE
1160 $(Q)$(MAKE) $(build)=$(package-dir) $@
1161 rpm: include/config/kernel.release FORCE
1162 $(Q)$(MAKE) $(build)=$(package-dir) $@
1165 # Brief documentation of the typical targets used
1166 # ---------------------------------------------------------------------------
1168 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1169 boards := $(notdir $(boards))
1172 @echo 'Cleaning targets:'
1173 @echo ' clean - Remove most generated files but keep the config and'
1174 @echo ' enough build support to build external modules'
1175 @echo ' mrproper - Remove all generated files + config + various backup files'
1176 @echo ' distclean - mrproper + remove editor backup and patch files'
1178 @echo 'Configuration targets:'
1179 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1181 @echo 'Other generic targets:'
1182 @echo ' all - Build all targets marked with [*]'
1183 @echo '* vmlinux - Build the bare kernel'
1184 @echo '* modules - Build all modules'
1185 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1186 @echo ' dir/ - Build all files in dir and below'
1187 @echo ' dir/file.[ois] - Build specified target only'
1188 @echo ' dir/file.ko - Build module including final link'
1189 @echo ' rpm - Build a kernel as an RPM package'
1190 @echo ' tags/TAGS - Generate tags file for editors'
1191 @echo ' cscope - Generate cscope index'
1192 @echo ' kernelrelease - Output the release version string'
1193 @echo ' kernelversion - Output the version stored in Makefile'
1194 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1195 echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1196 echo ' (default: $(INSTALL_HDR_PATH))'; \
1199 @echo 'Static analysers'
1200 @echo ' checkstack - Generate a list of stack hogs'
1201 @echo ' namespacecheck - Name space analysis on compiled kernel'
1202 @echo ' export_report - List the usages of all exported symbols'
1203 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1204 echo ' headers_check - Sanity check on exported headers'; \
1207 @echo 'Kernel packaging:'
1208 @$(MAKE) $(build)=$(package-dir) help
1210 @echo 'Documentation targets:'
1211 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1213 @echo 'Architecture specific targets ($(ARCH)):'
1214 @$(if $(archhelp),$(archhelp),\
1215 echo ' No architecture specific help defined for $(ARCH)')
1218 $(foreach b, $(boards), \
1219 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1222 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1223 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1224 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1225 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1226 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1228 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1229 @echo 'For further info see the ./README file'
1232 # Documentation targets
1233 # ---------------------------------------------------------------------------
1234 %docs: scripts_basic FORCE
1235 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1237 else # KBUILD_EXTMOD
1240 # External module support.
1241 # When building external modules the kernel used as basis is considered
1242 # read-only, and no consistency checks are made and the make
1243 # system is not used on the basis kernel. If updates are required
1244 # in the basis kernel ordinary make commands (without M=...) must
1247 # The following are the only valid targets when building external
1249 # make M=dir clean Delete all automatically generated files
1250 # make M=dir modules Make all modules in specified dir
1251 # make M=dir Same as 'make M=dir modules'
1252 # make M=dir modules_install
1253 # Install the modules built in the module directory
1254 # Assumes install directory is already created
1256 # We are always building modules
1258 PHONY += crmodverdir
1262 PHONY += $(objtree)/Module.symvers
1263 $(objtree)/Module.symvers:
1264 @test -e $(objtree)/Module.symvers || ( \
1266 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1267 echo " is missing; modules will have no dependencies and modversions."; \
1270 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1271 PHONY += $(module-dirs) modules
1272 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1273 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1275 modules: $(module-dirs)
1276 @echo ' Building modules, stage 2.';
1277 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1279 PHONY += modules_install
1280 modules_install: _emodinst_ _emodinst_post
1282 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1285 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1286 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1288 PHONY += _emodinst_post
1289 _emodinst_post: _emodinst_
1292 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1294 PHONY += $(clean-dirs) clean
1296 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1298 clean: rm-dirs := $(MODVERDIR)
1299 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1300 clean: $(clean-dirs)
1303 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1304 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1305 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1306 -type f -print | xargs rm -f
1309 @echo ' Building external modules.'
1310 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1312 @echo ' modules - default target, build the module(s)'
1313 @echo ' modules_install - install the module'
1314 @echo ' clean - remove generated files in module directory only'
1318 PHONY += prepare scripts
1321 endif # KBUILD_EXTMOD
1323 # Generate tags for editors
1324 # ---------------------------------------------------------------------------
1326 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1327 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1328 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1330 ifeq ($(src),$(obj))
1333 __srctree = $(srctree)/
1336 ifeq ($(ALLSOURCE_ARCHS),)
1338 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1340 ALLINCLUDE_ARCHS := $(SRCARCH)
1343 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1344 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1347 ALLSOURCE_ARCHS := $(SRCARCH)
1350 ( for arch in $(ALLSOURCE_ARCHS) ; do \
1351 find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
1354 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1356 find $(__srctree)include $(RCS_FIND_IGNORE) \
1357 \( -name config -o -name 'asm-*' \) -prune \
1358 -o -name $1 -print; \
1359 for arch in $(ALLINCLUDE_ARCHS) ; do \
1360 find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
1363 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1365 find $(__srctree) $(RCS_FIND_IGNORE) \
1366 \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
1372 $(call find-sources,'*.[chS]')
1375 $(call find-sources,'Kconfig*')
1377 define all-defconfigs
1378 $(call find-sources,'defconfig')
1382 if $1 --version 2>&1 | grep -iq exuberant; then \
1383 $(all-sources) | xargs $1 -a \
1384 -I __initdata,__exitdata,__acquires,__releases \
1385 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1386 --extra=+f --c-kinds=+px \
1387 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1388 $(all-kconfigs) | xargs $1 -a \
1390 --language-force=kconfig \
1391 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
1392 $(all-defconfigs) | xargs -r $1 -a \
1393 --langdef=dotconfig \
1394 --language-force=dotconfig \
1395 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1396 elif $1 --version 2>&1 | grep -iq emacs; then \
1397 $(all-sources) | xargs $1 -a; \
1398 $(all-kconfigs) | xargs $1 -a \
1399 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
1400 $(all-defconfigs) | xargs -r $1 -a \
1401 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1403 $(all-sources) | xargs $1 -a; \
1407 quiet_cmd_cscope-file = FILELST cscope.files
1408 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1410 quiet_cmd_cscope = MAKE cscope.out
1411 cmd_cscope = cscope -b
1414 $(call cmd,cscope-file)
1417 quiet_cmd_TAGS = MAKE $@
1426 quiet_cmd_tags = MAKE $@
1436 # Scripts to check various things for consistency
1437 # ---------------------------------------------------------------------------
1440 find * $(RCS_FIND_IGNORE) \
1441 -name '*.[hcS]' -type f -print | sort \
1442 | xargs $(PERL) -w scripts/checkincludes.pl
1445 find * $(RCS_FIND_IGNORE) \
1446 -name '*.[hcS]' -type f -print | sort \
1447 | xargs $(PERL) -w scripts/checkversion.pl
1450 $(PERL) $(srctree)/scripts/namespace.pl
1453 $(PERL) $(srctree)/scripts/export_report.pl
1455 endif #ifeq ($(config-targets),1)
1456 endif #ifeq ($(mixed-targets),1)
1458 PHONY += checkstack kernelrelease kernelversion
1460 # UML needs a little special treatment here. It wants to use the host
1461 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1462 # else wants $(ARCH), including people doing cross-builds, which means
1463 # that $(SUBARCH) doesn't work here.
1465 CHECKSTACK_ARCH := $(SUBARCH)
1467 CHECKSTACK_ARCH := $(ARCH)
1470 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1471 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1474 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1475 $(error kernelrelease not valid - run 'make prepare' to update it))
1477 @echo $(KERNELVERSION)
1480 # ---------------------------------------------------------------------------
1481 # Single targets are compatible with:
1482 # - build whith mixed source and output
1483 # - build with separate output dir 'make O=...'
1484 # - external modules
1486 # target-dir => where to store outputfile
1487 # build-dir => directory in kernel source tree to use
1489 ifeq ($(KBUILD_EXTMOD),)
1490 build-dir = $(patsubst %/,%,$(dir $@))
1491 target-dir = $(dir $@)
1493 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1494 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1495 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1498 %.s: %.c prepare scripts FORCE
1499 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1500 %.i: %.c prepare scripts FORCE
1501 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1502 %.o: %.c prepare scripts FORCE
1503 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1504 %.lst: %.c prepare scripts FORCE
1505 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1506 %.s: %.S prepare scripts FORCE
1507 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1508 %.o: %.S prepare scripts FORCE
1509 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1510 %.symtypes: %.c prepare scripts FORCE
1511 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1514 / %/: prepare scripts FORCE
1516 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1517 $(build)=$(build-dir)
1518 %.ko: prepare scripts FORCE
1520 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1521 $(build)=$(build-dir) $(@:.ko=.o)
1522 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1524 # FIXME Should go into a make.lib or something
1525 # ===========================================================================
1527 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1528 cmd_rmdirs = rm -rf $(rm-dirs)
1530 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1531 cmd_rmfiles = rm -f $(rm-files)
1533 # Run depmod only is we have System.map and depmod is executable
1534 # and we build for the host arch
1535 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1537 if [ -r System.map -a -x $(DEPMOD) ]; then \
1538 $(DEPMOD) -ae -F System.map \
1539 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r) \
1543 # Create temporary dir for module support files
1544 # clean it up only when building all modules
1545 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1546 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1548 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1549 $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
1550 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1552 quiet_cmd_as_o_S = AS $@
1553 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1555 # read all saved command lines
1557 targets := $(wildcard $(sort $(targets)))
1558 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1560 ifneq ($(cmd_files),)
1561 $(cmd_files): ; # Do not try to update included dependency files
1562 include $(cmd_files)
1565 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1567 # $(Q)$(MAKE) $(clean)=dir
1568 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1570 endif # skip-makefile
1575 # Declare the contents of the .PHONY variable as phony. We keep that
1576 # information in a variable se we can use it in if_changed and friends.