5 NAME = Flesh-Eating Bats with Fangs
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 # Avoid funny character set dependencies
23 export LC_COLLATE LC_NUMERIC
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.o targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
41 # To put more focus on warnings, be less verbose as default
42 # Use 'make V=1' to see the full commands
44 ifeq ("$(origin V)", "command line")
51 # Call a source code checker (by default, "sparse") as part of the
54 # Use 'make C=1' to enable checking of only re-compiled files.
55 # Use 'make C=2' to enable checking of *all* source files, regardless
56 # of whether they are re-compiled or not.
58 # See the file "Documentation/sparse.txt" for more details, including
59 # where to get the "sparse" utility.
61 ifeq ("$(origin C)", "command line")
62 KBUILD_CHECKSRC = $(C)
64 ifndef KBUILD_CHECKSRC
68 # Call message checker as part of the C compilation
70 # Use 'make D=1' to enable checking
71 # Use 'make D=2' to create the message catalog
74 ifeq ("$(origin D)", "command line")
75 KBUILD_KMSG_CHECK = $(D)
78 ifndef KBUILD_KMSG_CHECK
82 # Use make M=dir to specify directory of external module to build
83 # Old syntax make ... SUBDIRS=$PWD is still supported
84 # Setting the environment variable KBUILD_EXTMOD take precedence
86 KBUILD_EXTMOD ?= $(SUBDIRS)
89 ifeq ("$(origin M)", "command line")
93 # kbuild supports saving output files in a separate directory.
94 # To locate output files in a separate directory two syntaxes are supported.
95 # In both cases the working directory must be the root of the kernel src.
97 # Use "make O=dir/to/store/output/files/"
99 # 2) Set KBUILD_OUTPUT
100 # Set the environment variable KBUILD_OUTPUT to point to the directory
101 # where the output files shall be placed.
102 # export KBUILD_OUTPUT=dir/to/store/output/files/
105 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
109 # KBUILD_SRC is set on invocation of make in OBJ directory
110 # KBUILD_SRC is not intended to be used by the regular user (for now)
111 ifeq ($(KBUILD_SRC),)
113 # OK, Make called in directory where kernel src resides
114 # Do we want to locate output files in a separate directory?
115 ifeq ("$(origin O)", "command line")
116 KBUILD_OUTPUT := $(O)
119 # That's our default target when none is given on the command line
123 # Cancel implicit rules on top Makefile
124 $(CURDIR)/Makefile Makefile: ;
126 ifneq ($(KBUILD_OUTPUT),)
127 # Invoke a second make in the output directory, passing relevant variables
128 # check that the output directory actually exists
129 saved-output := $(KBUILD_OUTPUT)
130 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
131 $(if $(KBUILD_OUTPUT),, \
132 $(error output directory "$(saved-output)" does not exist))
134 PHONY += $(MAKECMDGOALS) sub-make
136 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
140 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
141 KBUILD_SRC=$(CURDIR) \
142 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
143 $(filter-out _all sub-make,$(MAKECMDGOALS))
145 # Leave processing to above invocation of make
147 endif # ifneq ($(KBUILD_OUTPUT),)
148 endif # ifeq ($(KBUILD_SRC),)
150 # We process the rest of the Makefile if this is the final invocation of make
151 ifeq ($(skip-makefile),)
153 # If building an external module we do not care about the all: rule
154 # but instead _all depend on modules
156 ifeq ($(KBUILD_EXTMOD),)
162 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
167 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
169 export srctree objtree VPATH
172 # SUBARCH tells the usermode build what the underlying arch is. That is set
173 # first, and if a usermode build is happening, the "ARCH=um" on the command
174 # line overrides the setting of ARCH below. If a native build is happening,
175 # then ARCH is assigned, getting whatever value it gets normally, and
176 # SUBARCH is subsequently ignored.
178 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
179 -e s/arm.*/arm/ -e s/sa110/arm/ \
180 -e s/s390x/s390/ -e s/parisc64/parisc/ \
181 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
184 # Cross compiling and selecting different set of gcc/bin-utils
185 # ---------------------------------------------------------------------------
187 # When performing cross compilation for other architectures ARCH shall be set
188 # to the target architecture. (See arch/* for the possibilities).
189 # ARCH can be set during invocation of make:
191 # Another way is to have ARCH set in the environment.
192 # The default ARCH is the host where make is executed.
194 # CROSS_COMPILE specify the prefix used for all executables used
195 # during compilation. Only gcc and related bin-utils executables
196 # are prefixed with $(CROSS_COMPILE).
197 # CROSS_COMPILE can be set on the command line
198 # make CROSS_COMPILE=ia64-linux-
199 # Alternatively CROSS_COMPILE can be set in the environment.
200 # A third alternative is to store a setting in .config so that plain
201 # "make" in the configured kernel build directory always uses that.
202 # Default value for CROSS_COMPILE is not to prefix executables
203 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
204 export KBUILD_BUILDHOST := $(SUBARCH)
206 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
208 # Architecture as present in compile.h
209 UTS_MACHINE := $(ARCH)
212 # Additional ARCH settings for x86
216 ifeq ($(ARCH),x86_64)
220 # Additional ARCH settings for sparc
221 ifeq ($(ARCH),sparc32)
224 ifeq ($(ARCH),sparc64)
228 # Additional ARCH settings for sh
233 # Where to locate arch specific headers
234 hdr-arch := $(SRCARCH)
236 ifeq ($(ARCH),m68knommu)
240 KCONFIG_CONFIG ?= .config
241 export KCONFIG_CONFIG
243 # SHELL used by kbuild
244 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
245 else if [ -x /bin/bash ]; then echo /bin/bash; \
246 else echo sh; fi ; fi)
250 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
253 # Decide whether to build built-in, modular, or both.
254 # Normally, just do built-in.
259 # If we have only "make modules", don't compile built-in objects.
260 # When we're building modules with modversions, we need to consider
261 # the built-in objects during the descend as well, in order to
262 # make sure the checksums are up to date before we record them.
264 ifeq ($(MAKECMDGOALS),modules)
265 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
268 # If we have "make <whatever> modules", compile modules
269 # in addition to whatever we do anyway.
270 # Just "make" or "make all" shall build modules as well
272 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
276 ifeq ($(MAKECMDGOALS),)
280 export KBUILD_MODULES KBUILD_BUILTIN
281 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
284 # ---------------------------------------------------------------------------
286 # Normally, we echo the whole command before executing it. By making
287 # that echo $($(quiet)$(cmd)), we now have the possibility to set
288 # $(quiet) to choose other forms of output instead, e.g.
290 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
291 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
293 # If $(quiet) is empty, the whole command will be printed.
294 # If it is set to "quiet_", only the short version will be printed.
295 # If it is set to "silent_", nothing will be printed at all, since
296 # the variable $(silent_cmd_cc_o_c) doesn't exist.
298 # A simple variant is to prefix commands with $(Q) - that's useful
299 # for commands that shall be hidden in non-verbose mode.
303 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
304 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
306 ifeq ($(KBUILD_VERBOSE),1)
314 # If the user is running make -s (silent mode), suppress echoing of
317 ifneq ($(findstring s,$(MAKEFLAGS)),)
321 export quiet Q KBUILD_VERBOSE
324 # Look for make include files relative to root of kernel src
325 MAKEFLAGS += --include-dir=$(srctree)
327 # We need some generic definitions (do not try to remake the file).
328 $(srctree)/scripts/Kbuild.include: ;
329 include $(srctree)/scripts/Kbuild.include
331 # Make variables (CC, etc...)
333 AS = $(CROSS_COMPILE)as
334 LD = $(CROSS_COMPILE)ld
335 CC = $(CROSS_COMPILE)gcc
337 AR = $(CROSS_COMPILE)ar
338 NM = $(CROSS_COMPILE)nm
339 STRIP = $(CROSS_COMPILE)strip
340 OBJCOPY = $(CROSS_COMPILE)objcopy
341 OBJDUMP = $(CROSS_COMPILE)objdump
343 GENKSYMS = scripts/genksyms/genksyms
344 INSTALLKERNEL := installkernel
345 DEPMOD = /sbin/depmod
346 KALLSYMS = scripts/kallsyms
350 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
351 -Wbitwise -Wno-return-void $(CF)
352 KMSG_CHECK = $(srctree)/scripts/kmsg-doc
358 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
361 # Use LINUXINCLUDE when you must reference the include/ directory.
362 # Needed to be compatible with the O= option
363 LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
364 $(if $(KBUILD_SRC), -I$(srctree)/include) \
365 -include include/generated/autoconf.h
367 KBUILD_CPPFLAGS := -D__KERNEL__
369 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
370 -fno-strict-aliasing -fno-common \
371 -Werror-implicit-function-declaration \
372 -Wno-format-security \
373 -fno-delete-null-pointer-checks
374 KBUILD_AFLAGS_KERNEL :=
375 KBUILD_CFLAGS_KERNEL :=
376 KBUILD_AFLAGS := -D__ASSEMBLY__
377 KBUILD_AFLAGS_MODULE := -DMODULE
378 KBUILD_CFLAGS_MODULE := -DMODULE
379 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
381 # Warn about unsupported modules in kernels built inside Autobuild
382 ifneq ($(wildcard /.buildenv),)
383 CFLAGS += -DUNSUPPORTED_MODULES=2
386 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
387 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
388 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
390 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
391 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
392 export CPP AR NM STRIP OBJCOPY OBJDUMP
393 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
394 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
396 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
397 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
398 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
399 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
400 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
401 export KBUILD_KMSG_CHECK KMSG_CHECK
403 # When compiling out-of-tree modules, put MODVERDIR in the module
404 # tree rather than in the kernel tree. The kernel tree might
406 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
408 # Files to ignore in find ... statements
410 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
411 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
413 # ===========================================================================
414 # Rules shared between *config targets and build targets
416 # Basic helpers built in scripts/
417 PHONY += scripts_basic
419 $(Q)$(MAKE) $(build)=scripts/basic
420 $(Q)rm -f .tmp_quiet_recordmcount
422 # To avoid any implicit rule to kick in, define an empty command.
423 scripts/basic/%: scripts_basic ;
425 PHONY += outputmakefile
426 # outputmakefile generates a Makefile in the output directory, if using a
427 # separate output directory. This allows convenient use of make in the
430 ifneq ($(KBUILD_SRC),)
431 $(Q)ln -fsn $(srctree) source
432 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
433 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
436 # To make sure we do not include .config for any of the *config targets
437 # catch them early, and hand them over to scripts/kconfig/Makefile
438 # It is allowed to specify more targets when calling make, including
439 # mixing *config targets and build targets.
440 # For example 'make oldconfig all'.
441 # Detect when mixed targets is specified, and make a second invocation
442 # of make so .config is not included in this case either (for *config).
444 no-dot-config-targets := clean mrproper distclean \
445 cscope TAGS tags help %docs check% coccicheck \
446 include/linux/version.h headers_% \
447 kernelversion %src-pkg
453 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
454 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
459 ifeq ($(KBUILD_EXTMOD),)
460 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
462 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
468 ifeq ($(mixed-targets),1)
469 # ===========================================================================
470 # We're called with mixed targets (*config and build targets).
471 # Handle them one by one.
474 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
477 ifeq ($(config-targets),1)
478 # ===========================================================================
479 # *config targets only - make sure prerequisites are updated, and descend
480 # in scripts/kconfig to make the *config target
482 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
483 # KBUILD_DEFCONFIG may point out an alternative default configuration
484 # used for 'make defconfig'
485 include $(srctree)/arch/$(SRCARCH)/Makefile
486 export KBUILD_DEFCONFIG KBUILD_KCONFIG
488 config: scripts_basic outputmakefile FORCE
489 $(Q)mkdir -p include/linux include/config
490 $(Q)$(MAKE) $(build)=scripts/kconfig $@
492 %config: scripts_basic outputmakefile FORCE
493 $(Q)mkdir -p include/linux include/config
494 $(Q)$(MAKE) $(build)=scripts/kconfig $@
497 # ===========================================================================
498 # Build targets only - this includes vmlinux, arch specific targets, clean
499 # targets and others. In general all targets except *config targets.
501 ifeq ($(KBUILD_EXTMOD),)
502 # Additional helpers built in scripts/
503 # Carefully list dependencies so we do not try to build scripts twice
506 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
507 $(Q)$(MAKE) $(build)=$(@)
509 # Objects we will link into vmlinux / subdirs we need to visit
511 drivers-y := drivers/ sound/ firmware/
515 endif # KBUILD_EXTMOD
517 ifeq ($(dot-config),1)
519 -include include/config/auto.conf
521 ifeq ($(KBUILD_EXTMOD),)
522 # Read in dependencies to all Kconfig* files, make sure to run
523 # oldconfig if changes are detected.
524 -include include/config/auto.conf.cmd
526 # To avoid any implicit rule to kick in, define an empty command
527 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
529 # If .config is newer than include/config/auto.conf, someone tinkered
530 # with it and forgot to run make oldconfig.
531 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
532 # we execute the config step to be sure to catch updated Kconfig files
533 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
534 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
536 # external modules needs include/generated/autoconf.h and include/config/auto.conf
537 # but do not care if they are up-to-date. Use auto.conf to trigger the test
538 PHONY += include/config/auto.conf
540 include/config/auto.conf:
541 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
543 echo " ERROR: Kernel configuration is invalid."; \
544 echo " include/generated/autoconf.h or $@ are missing.";\
545 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
549 endif # KBUILD_EXTMOD
552 # Dummy target needed, because used as prerequisite
553 include/config/auto.conf: ;
554 endif # $(dot-config)
556 # The all: target is the default when no target is given on the
558 # This allow a user to issue only 'make' to build a kernel including modules
559 # Defaults to vmlinux, but the arch makefile usually adds further targets
562 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
568 include $(srctree)/arch/$(SRCARCH)/Makefile
570 ifneq ($(CONFIG_FRAME_WARN),0)
571 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
574 # Force gcc to behave correct even for buggy distributions
575 ifndef CONFIG_CC_STACKPROTECTOR
576 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
579 ifdef CONFIG_FRAME_POINTER
580 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
582 # Some targets (ARM with Thumb2, for example), can't be built with frame
583 # pointers. For those, we don't have FUNCTION_TRACER automatically
584 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
585 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
586 # -fomit-frame-pointer with FUNCTION_TRACER.
587 ifndef CONFIG_FUNCTION_TRACER
588 KBUILD_CFLAGS += -fomit-frame-pointer
592 ifdef CONFIG_DEBUG_INFO
594 KBUILD_AFLAGS += -gdwarf-2
597 ifdef CONFIG_DEBUG_INFO_REDUCED
598 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
601 ifdef CONFIG_FUNCTION_TRACER
603 ifdef CONFIG_DYNAMIC_FTRACE
604 ifdef CONFIG_HAVE_C_RECORDMCOUNT
605 BUILD_C_RECORDMCOUNT := y
606 export BUILD_C_RECORDMCOUNT
611 # We trigger additional mismatches with less inlining
612 ifdef CONFIG_DEBUG_SECTION_MISMATCH
613 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
616 # arch Makefile may override CC so keep this after arch Makefile is included
617 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
618 CHECKFLAGS += $(NOSTDINC_FLAGS)
620 # warn about C99 declaration after statement
621 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
623 # disable pointer signed / unsigned warnings in gcc 4.0
624 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
626 # disable invalid "can't wrap" optimizations for signed / pointers
627 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
629 # conserve stack if available
630 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
632 # check for 'asm goto'
633 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
634 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
637 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
638 # But warn user when we do so
640 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
642 ifneq ($(KCPPFLAGS),)
643 $(call warn-assign,CPPFLAGS)
644 KBUILD_CPPFLAGS += $(KCPPFLAGS)
647 $(call warn-assign,AFLAGS)
648 KBUILD_AFLAGS += $(KAFLAGS)
651 $(call warn-assign,CFLAGS)
652 KBUILD_CFLAGS += $(KCFLAGS)
655 # Use --build-id when available.
656 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
657 $(call cc-ldoption, -Wl$(comma)--build-id,))
658 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
659 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
661 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
662 LDFLAGS_vmlinux += $(call ld-option, -X,)
665 # Default kernel image to build when no specific target is given.
666 # KBUILD_IMAGE may be overruled on the command line or
667 # set in the environment
668 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
670 export KBUILD_IMAGE ?= vmlinux
673 # INSTALL_PATH specifies where to place the updated kernel and system map
674 # images. Default is /boot, but you can set it to other values
675 export INSTALL_PATH ?= /boot
678 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
679 # relocations required by build roots. This is not defined in the
680 # makefile but the argument can be passed to make if needed.
683 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
687 # INSTALL_MOD_STRIP, if defined, will cause modules to be
688 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
689 # the default option --strip-debug will be used. Otherwise,
690 # INSTALL_MOD_STRIP will used as the options to the strip command.
692 ifdef INSTALL_MOD_STRIP
693 ifeq ($(INSTALL_MOD_STRIP),1)
694 mod_strip_cmd = $(STRIP) --strip-debug
696 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
697 endif # INSTALL_MOD_STRIP=1
700 endif # INSTALL_MOD_STRIP
704 ifeq ($(KBUILD_EXTMOD),)
705 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
707 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
708 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
709 $(net-y) $(net-m) $(libs-y) $(libs-m)))
711 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
713 $(core-n) $(core-) $(drivers-n) $(drivers-) \
714 $(net-n) $(net-) $(libs-n) $(libs-))))
716 init-y := $(patsubst %/, %/built-in.o, $(init-y))
717 core-y := $(patsubst %/, %/built-in.o, $(core-y))
718 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
719 net-y := $(patsubst %/, %/built-in.o, $(net-y))
720 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
721 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
722 libs-y := $(libs-y1) $(libs-y2)
725 # ---------------------------------------------------------------------------
726 # vmlinux is built from the objects selected by $(vmlinux-init) and
727 # $(vmlinux-main). Most are built-in.o files from top-level directories
728 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
729 # Ordering when linking is important, and $(vmlinux-init) must be first.
734 # +-< $(vmlinux-init)
735 # | +--< init/version.o + more
737 # +--< $(vmlinux-main)
738 # | +--< driver/built-in.o mm/built-in.o + more
740 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
742 # vmlinux version (uname -v) cannot be updated during normal
743 # descending-into-subdirs phase since we do not yet know if we need to
745 # Therefore this step is delayed until just before final link of vmlinux -
746 # except in the kallsyms case where it is done just before adding the
747 # symbols to the kernel.
749 # System.map is generated to document addresses of all kernel symbols
751 vmlinux-init := $(head-y) $(init-y)
752 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
753 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
754 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
755 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
757 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
758 # May be overridden by arch/$(ARCH)/Makefile
759 quiet_cmd_vmlinux__ ?= LD $@
760 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
761 -T $(vmlinux-lds) $(vmlinux-init) \
762 --start-group $(vmlinux-main) --end-group \
763 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
765 # Generate new vmlinux version
766 quiet_cmd_vmlinux_version = GEN .version
767 cmd_vmlinux_version = set -e; \
768 if [ ! -r .version ]; then \
772 mv .version .old_version; \
773 expr 0$$(cat .old_version) + 1 >.version; \
775 $(MAKE) $(build)=init
777 # Generate System.map
778 quiet_cmd_sysmap = SYSMAP
779 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
782 # If CONFIG_KALLSYMS is set .version is already updated
783 # Generate System.map and verify that the content is consistent
784 # Use + in front of the vmlinux_version rule to silent warning with make -j2
785 # First command is ':' to allow us to use + in front of the rule
786 define rule_vmlinux__
788 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
790 $(call cmd,vmlinux__)
791 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
793 $(Q)$(if $($(quiet)cmd_sysmap), \
794 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
795 $(cmd_sysmap) $@ System.map; \
796 if [ $$? -ne 0 ]; then \
804 ifdef CONFIG_KALLSYMS
805 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
806 # It's a three stage process:
807 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
809 # Running kallsyms on that gives us .tmp_kallsyms1.o with
810 # the right size - vmlinux version (uname -v) is updated during this step
811 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
812 # but due to the added section, some addresses have shifted.
813 # From here, we generate a correct .tmp_kallsyms2.o
814 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
815 # o Verify that the System.map from vmlinux matches the map from
816 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
817 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
818 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
819 # temporary bypass to allow the kernel to be built while the
820 # maintainers work out what went wrong with kallsyms.
822 ifdef CONFIG_KALLSYMS_EXTRA_PASS
828 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
830 define verify_kallsyms
831 $(Q)$(if $($(quiet)cmd_sysmap), \
832 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
833 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
834 $(Q)cmp -s System.map .tmp_System.map || \
835 (echo Inconsistent kallsyms data; \
836 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
837 rm .tmp_kallsyms* ; /bin/false )
840 # Update vmlinux version before link
841 # Use + in front of this rule to silent warning about make -j1
842 # First command is ':' to allow us to use + in front of this rule
843 cmd_ksym_ld = $(cmd_vmlinux__)
846 +$(call cmd,vmlinux_version)
847 $(call cmd,vmlinux__)
848 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
851 # Generate .S file with all kernel symbols
852 quiet_cmd_kallsyms = KSYM $@
853 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
854 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
856 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
857 $(call if_changed_dep,as_o_S)
859 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
862 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
863 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
864 $(call if_changed_rule,ksym_ld)
866 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
867 $(call if_changed,vmlinux__)
869 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
870 $(call if_changed,vmlinux__)
872 # Needs to visit scripts/ before $(KALLSYMS) can be used.
873 $(KALLSYMS): scripts ;
875 # Generate some data for debugging strange kallsyms problems
876 debug_kallsyms: .tmp_map$(last_kallsyms)
878 .tmp_map%: .tmp_vmlinux% FORCE
879 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
885 endif # ifdef CONFIG_KALLSYMS
887 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
888 # relevant sections renamed as per the linker script.
889 quiet_cmd_vmlinux-modpost = LD $@
890 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
891 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
892 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
893 define rule_vmlinux-modpost
895 +$(call cmd,vmlinux-modpost)
896 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
897 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
900 # vmlinux image - including updated kernel symbols
901 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
902 ifdef CONFIG_HEADERS_CHECK
903 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
906 $(Q)$(MAKE) $(build)=samples
908 ifdef CONFIG_BUILD_DOCSRC
909 $(Q)$(MAKE) $(build)=Documentation
911 $(call vmlinux-modpost)
912 $(call if_changed_rule,vmlinux__)
913 $(Q)rm -f .old_version
915 # build vmlinux.o first to catch section mismatch errors early
916 ifdef CONFIG_KALLSYMS
917 .tmp_vmlinux1: vmlinux.o
920 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
921 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
922 $(call if_changed_rule,vmlinux-modpost)
924 # The actual objects are generated when descending,
925 # make sure no implicit rule kicks in
926 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
928 # Handle descending into subdirectories listed in $(vmlinux-dirs)
929 # Preset locale variables to speed up the build process. Limit locale
930 # tweaks to this spot to avoid wrong language settings when running
931 # make menuconfig etc.
932 # Error messages still appears in the original language
934 PHONY += $(vmlinux-dirs)
935 $(vmlinux-dirs): prepare scripts
936 $(Q)$(MAKE) $(build)=$@
938 # Store (new) KERNELRELASE string in include/config/kernel.release
939 include/config/kernel.release: include/config/auto.conf FORCE
941 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
944 # Things we need to do before we recursively start building the kernel
945 # or the modules are listed in "prepare".
946 # A multi level approach is used. prepareN is processed before prepareN-1.
947 # archprepare is used in arch Makefiles and when processed asm symlink,
948 # version.h and scripts_basic is processed / created.
950 # Listed in dependency order
951 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
953 # prepare3 is used to check if we are building in a separate output directory,
955 # 1) Check that make has not been executed in the kernel src $(srctree)
956 prepare3: include/config/kernel.release
957 ifneq ($(KBUILD_SRC),)
958 @$(kecho) ' Using $(srctree) as source for kernel'
959 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
960 echo " $(srctree) is not clean, please run 'make mrproper'";\
961 echo " in the '$(srctree)' directory.";\
966 # prepare2 creates a makefile if using a separate output directory
967 prepare2: prepare3 outputmakefile
969 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
970 include/config/auto.conf
973 archprepare: prepare1 scripts_basic
975 prepare0: archprepare FORCE
976 $(Q)$(MAKE) $(build)=.
977 $(Q)$(MAKE) $(build)=. missing-syscalls
979 # All the preparing..
982 # Generate some files
983 # ---------------------------------------------------------------------------
985 # KERNELRELEASE can change from a few different places, meaning version.h
986 # needs to be updated, so this check is forced on all builds
989 define filechk_utsrelease.h
990 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
991 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
994 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
997 define filechk_version.h
998 (echo \#define LINUX_VERSION_CODE $(shell \
999 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1000 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1003 include/linux/version.h: $(srctree)/Makefile FORCE
1004 $(call filechk,version.h)
1006 include/generated/utsrelease.h: include/config/kernel.release FORCE
1007 $(call filechk,utsrelease.h)
1011 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1013 # ---------------------------------------------------------------------------
1017 @echo '*** Warning: make $@ is unnecessary now.'
1019 # ---------------------------------------------------------------------------
1021 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware/$(KERNELRELEASE)
1022 export INSTALL_FW_PATH
1024 PHONY += firmware_install
1025 firmware_install: FORCE
1026 @mkdir -p $(objtree)/firmware
1027 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1029 # ---------------------------------------------------------------------------
1032 #Default location for installed headers
1033 export INSTALL_HDR_PATH = $(objtree)/usr
1035 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1037 # If we do an all arch process set dst to asm-$(hdr-arch)
1038 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1041 __headers: include/linux/version.h scripts_basic FORCE
1042 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1044 PHONY += headers_install_all
1045 headers_install_all:
1046 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1048 PHONY += headers_install
1049 headers_install: __headers
1050 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1051 $(error Headers not exportable for the $(SRCARCH) architecture))
1052 $(Q)$(MAKE) $(hdr-inst)=include
1053 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1055 PHONY += headers_check_all
1056 headers_check_all: headers_install_all
1057 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1059 PHONY += headers_check
1060 headers_check: headers_install
1061 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1062 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1064 # ---------------------------------------------------------------------------
1067 ifdef CONFIG_MODULES
1069 # By default, build modules as well
1075 # A module can be listed more than once in obj-m resulting in
1076 # duplicate lines in modules.order files. Those are removed
1077 # using awk while concatenating to the final file.
1080 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1081 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1082 @$(kecho) ' Building modules, stage 2.';
1083 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1084 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1086 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1087 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1089 %/modules.builtin: include/config/auto.conf
1090 $(Q)$(MAKE) $(modbuiltin)=$*
1093 # Target to prepare building external modules
1094 PHONY += modules_prepare
1095 modules_prepare: prepare scripts
1097 # Target to install modules
1098 PHONY += modules_install
1099 modules_install: _modinst_ _modinst_post
1103 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1104 echo "Warning: you may need to install module-init-tools"; \
1105 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1108 @rm -rf $(MODLIB)/kernel
1109 @rm -f $(MODLIB)/source
1110 @mkdir -p $(MODLIB)/kernel
1111 @ln -s $(srctree) $(MODLIB)/source
1112 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1113 rm -f $(MODLIB)/build ; \
1114 ln -s $(objtree) $(MODLIB)/build ; \
1116 @cp -f $(objtree)/modules.order $(MODLIB)/
1117 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1118 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1120 # This depmod is only for convenience to give the initial
1121 # boot a modules.dep even before / is mounted read-write. However the
1122 # boot script depmod is the master version.
1123 PHONY += _modinst_post
1124 _modinst_post: _modinst_
1125 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1128 else # CONFIG_MODULES
1130 # Modules not configured
1131 # ---------------------------------------------------------------------------
1133 modules modules_install: FORCE
1135 @echo "The present kernel configuration has modules disabled."
1136 @echo "Type 'make config' and enable loadable module support."
1137 @echo "Then build a kernel with module support enabled."
1141 endif # CONFIG_MODULES
1144 # Cleaning is done on three levels.
1145 # make clean Delete most generated files
1146 # Leave enough to build external modules
1147 # make mrproper Delete the current configuration, and all generated files
1148 # make distclean Remove editor backup files, patch leftover files and the like
1150 # Directories & files removed with 'make clean'
1151 CLEAN_DIRS += $(MODVERDIR)
1152 CLEAN_FILES += vmlinux System.map \
1153 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1155 # Directories & files removed with 'make mrproper'
1156 MRPROPER_DIRS += include/config usr/include include/generated
1157 MRPROPER_FILES += .config .config.old .version .old_version \
1158 include/linux/version.h \
1159 Module.symvers tags TAGS cscope*
1161 # clean - Delete most, but leave enough to build external modules
1163 clean: rm-dirs := $(CLEAN_DIRS)
1164 clean: rm-files := $(CLEAN_FILES)
1165 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1167 PHONY += $(clean-dirs) clean archclean
1169 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1173 # mrproper - Delete all generated files, including .config
1175 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1176 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1177 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1179 PHONY += $(mrproper-dirs) mrproper archmrproper
1181 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1183 mrproper: clean archmrproper $(mrproper-dirs)
1192 @find $(srctree) $(RCS_FIND_IGNORE) \
1193 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1194 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1195 -o -name '.*.rej' -o -size 0 \
1196 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1197 -type f -print | xargs rm -f
1200 # Packaging of the kernel to various formats
1201 # ---------------------------------------------------------------------------
1202 # rpm target kept for backward compatibility
1203 package-dir := $(srctree)/scripts/package
1206 $(Q)$(MAKE) $(build)=$(package-dir) $@
1207 %pkg: include/config/kernel.release FORCE
1208 $(Q)$(MAKE) $(build)=$(package-dir) $@
1209 rpm: include/config/kernel.release FORCE
1210 $(Q)$(MAKE) $(build)=$(package-dir) $@
1213 # Brief documentation of the typical targets used
1214 # ---------------------------------------------------------------------------
1216 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1217 boards := $(notdir $(boards))
1218 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1219 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1222 @echo 'Cleaning targets:'
1223 @echo ' clean - Remove most generated files but keep the config and'
1224 @echo ' enough build support to build external modules'
1225 @echo ' mrproper - Remove all generated files + config + various backup files'
1226 @echo ' distclean - mrproper + remove editor backup and patch files'
1228 @echo 'Configuration targets:'
1229 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1231 @echo 'Other generic targets:'
1232 @echo ' all - Build all targets marked with [*]'
1233 @echo '* vmlinux - Build the bare kernel'
1234 @echo '* modules - Build all modules'
1235 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1236 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1237 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1238 @echo ' dir/ - Build all files in dir and below'
1239 @echo ' dir/file.[oisS] - Build specified target only'
1240 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1241 @echo ' (requires a recent binutils and recent build (System.map))'
1242 @echo ' dir/file.ko - Build module including final link'
1243 @echo ' modules_prepare - Set up for building external modules'
1244 @echo ' tags/TAGS - Generate tags file for editors'
1245 @echo ' cscope - Generate cscope index'
1246 @echo ' kernelrelease - Output the release version string'
1247 @echo ' kernelversion - Output the version stored in Makefile'
1248 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1249 echo ' (default: $(INSTALL_HDR_PATH))'; \
1251 @echo 'Static analysers'
1252 @echo ' checkstack - Generate a list of stack hogs'
1253 @echo ' namespacecheck - Name space analysis on compiled kernel'
1254 @echo ' versioncheck - Sanity check on version.h usage'
1255 @echo ' includecheck - Check for duplicate included header files'
1256 @echo ' export_report - List the usages of all exported symbols'
1257 @echo ' headers_check - Sanity check on exported headers'
1258 @echo ' headerdep - Detect inclusion cycles in headers'
1259 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1261 @echo 'Kernel packaging:'
1262 @$(MAKE) $(build)=$(package-dir) help
1264 @echo 'Documentation targets:'
1265 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1267 @echo 'Architecture specific targets ($(SRCARCH)):'
1268 @$(if $(archhelp),$(archhelp),\
1269 echo ' No architecture specific help defined for $(SRCARCH)')
1272 $(foreach b, $(boards), \
1273 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1275 @$(if $(board-dirs), \
1276 $(foreach b, $(board-dirs), \
1277 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1278 printf " %-16s - Show all of the above\\n" help-boards; \
1281 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1282 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1283 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1284 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1285 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1287 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1288 @echo 'For further info see the ./README file'
1291 help-board-dirs := $(addprefix help-,$(board-dirs))
1293 help-boards: $(help-board-dirs)
1295 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1297 $(help-board-dirs): help-%:
1298 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1299 @$(if $(boards-per-dir), \
1300 $(foreach b, $(boards-per-dir), \
1301 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1305 # Documentation targets
1306 # ---------------------------------------------------------------------------
1307 %docs: scripts_basic FORCE
1308 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1310 else # KBUILD_EXTMOD
1313 # External module support.
1314 # When building external modules the kernel used as basis is considered
1315 # read-only, and no consistency checks are made and the make
1316 # system is not used on the basis kernel. If updates are required
1317 # in the basis kernel ordinary make commands (without M=...) must
1320 # The following are the only valid targets when building external
1322 # make M=dir clean Delete all automatically generated files
1323 # make M=dir modules Make all modules in specified dir
1324 # make M=dir Same as 'make M=dir modules'
1325 # make M=dir modules_install
1326 # Install the modules built in the module directory
1327 # Assumes install directory is already created
1329 # We are always building modules
1331 PHONY += crmodverdir
1335 PHONY += $(objtree)/Module.symvers
1336 $(objtree)/Module.symvers:
1337 @test -e $(objtree)/Module.symvers || ( \
1339 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1340 echo " is missing; modules will have no dependencies and modversions."; \
1343 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1344 PHONY += $(module-dirs) modules
1345 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1346 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1348 modules: $(module-dirs)
1349 @$(kecho) ' Building modules, stage 2.';
1350 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1352 PHONY += modules_install
1353 modules_install: _emodinst_ _emodinst_post
1355 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1358 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1359 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1361 PHONY += _emodinst_post
1362 _emodinst_post: _emodinst_
1365 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1367 PHONY += $(clean-dirs) clean
1369 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1371 clean: rm-dirs := $(MODVERDIR)
1372 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1375 @echo ' Building external modules.'
1376 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1378 @echo ' modules - default target, build the module(s)'
1379 @echo ' modules_install - install the module'
1380 @echo ' clean - remove generated files in module directory only'
1384 PHONY += prepare scripts
1387 endif # KBUILD_EXTMOD
1389 clean: $(clean-dirs)
1392 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1393 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1394 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1395 -o -name '*.symtypes' -o -name 'modules.order' \
1396 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1397 -o -name '*.gcno' \) -type f -print | xargs rm -f
1399 # Generate tags for editors
1400 # ---------------------------------------------------------------------------
1401 quiet_cmd_tags = GEN $@
1402 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1404 tags TAGS cscope: FORCE
1407 # Scripts to check various things for consistency
1408 # ---------------------------------------------------------------------------
1411 find * $(RCS_FIND_IGNORE) \
1412 -name '*.[hcS]' -type f -print | sort \
1413 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1416 find * $(RCS_FIND_IGNORE) \
1417 -name '*.[hcS]' -type f -print | sort \
1418 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1421 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1424 $(PERL) $(srctree)/scripts/namespace.pl
1427 $(PERL) $(srctree)/scripts/export_report.pl
1429 endif #ifeq ($(config-targets),1)
1430 endif #ifeq ($(mixed-targets),1)
1432 PHONY += checkstack kernelrelease kernelversion
1434 # UML needs a little special treatment here. It wants to use the host
1435 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1436 # else wants $(ARCH), including people doing cross-builds, which means
1437 # that $(SUBARCH) doesn't work here.
1439 CHECKSTACK_ARCH := $(SUBARCH)
1441 CHECKSTACK_ARCH := $(ARCH)
1444 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1445 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1448 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1451 @echo $(KERNELVERSION)
1454 # ---------------------------------------------------------------------------
1455 # Single targets are compatible with:
1456 # - build with mixed source and output
1457 # - build with separate output dir 'make O=...'
1458 # - external modules
1460 # target-dir => where to store outputfile
1461 # build-dir => directory in kernel source tree to use
1463 ifeq ($(KBUILD_EXTMOD),)
1464 build-dir = $(patsubst %/,%,$(dir $@))
1465 target-dir = $(dir $@)
1467 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1468 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1469 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1472 %.s: %.c prepare scripts FORCE
1473 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1474 %.i: %.c prepare scripts FORCE
1475 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1476 %.o: %.c prepare scripts FORCE
1477 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1478 %.lst: %.c prepare scripts FORCE
1479 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1480 %.s: %.S prepare scripts FORCE
1481 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1482 %.o: %.S prepare scripts FORCE
1483 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1484 %.symtypes: %.c prepare scripts FORCE
1485 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1488 /: prepare scripts FORCE
1490 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1491 $(build)=$(build-dir)
1492 %/: prepare scripts FORCE
1494 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1495 $(build)=$(build-dir)
1496 %.ko: prepare scripts FORCE
1498 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1499 $(build)=$(build-dir) $(@:.ko=.o)
1500 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1502 # FIXME Should go into a make.lib or something
1503 # ===========================================================================
1505 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1506 cmd_rmdirs = rm -rf $(rm-dirs)
1508 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1509 cmd_rmfiles = rm -f $(rm-files)
1511 # Run depmod only if we have System.map and depmod is executable
1512 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1514 if [ -r System.map -a -x $(DEPMOD) ]; then \
1515 $(DEPMOD) -ae -F System.map \
1516 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1520 # Create temporary dir for module support files
1521 # clean it up only when building all modules
1522 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1523 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1525 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1526 $(KBUILD_AFLAGS_KERNEL) \
1527 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1528 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1530 quiet_cmd_as_o_S = AS $@
1531 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1533 # read all saved command lines
1535 targets := $(wildcard $(sort $(targets)))
1536 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1538 ifneq ($(cmd_files),)
1539 $(cmd_files): ; # Do not try to update included dependency files
1540 include $(cmd_files)
1543 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1545 # $(Q)$(MAKE) $(clean)=dir
1546 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1548 endif # skip-makefile
1553 # Declare the contents of the .PHONY variable as phony. We keep that
1554 # information in a variable so we can use it in if_changed and friends.