5 NAME = Temporary Tasmanian Devil
8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
14 # o use make's built-in rules and variables
15 # (this increases performance and avoids hard-to-debug behaviour);
16 # o print "Entering directory ...";
17 MAKEFLAGS += -rR --no-print-directory
19 # We are using a recursive build, so we need to do a little thinking
20 # to get the ordering right.
22 # Most importantly: sub-Makefiles should only ever modify files in
23 # their own directory. If in some directory we have a dependency on
24 # a file in another dir (which doesn't happen often, but it's often
25 # unavoidable when linking the built-in.o targets which finally
26 # turn into vmlinux), we will call a sub make in that other dir, and
27 # after that we are sure that everything which is in that other dir
30 # The only cases where we need to modify files which have global
31 # effects are thus separated out and done before the recursive
32 # descending is started. They are now explicitly listed as the
35 # To put more focus on warnings, be less verbose as default
36 # Use 'make V=1' to see the full commands
39 ifeq ("$(origin V)", "command line")
47 # Call a source code checker (by default, "sparse") as part of the
50 # Use 'make C=1' to enable checking of only re-compiled files.
51 # Use 'make C=2' to enable checking of *all* source files, regardless
52 # of whether they are re-compiled or not.
54 # See the file "Documentation/sparse.txt" for more details, including
55 # where to get the "sparse" utility.
58 ifeq ("$(origin C)", "command line")
59 KBUILD_CHECKSRC = $(C)
62 ifndef KBUILD_CHECKSRC
66 # Use make M=dir to specify directory of external module to build
67 # Old syntax make ... SUBDIRS=$PWD is still supported
68 # Setting the environment variable KBUILD_EXTMOD take precedence
70 KBUILD_EXTMOD ?= $(SUBDIRS)
73 ifeq ("$(origin M)", "command line")
79 # kbuild supports saving output files in a separate directory.
80 # To locate output files in a separate directory two syntaxes are supported.
81 # In both cases the working directory must be the root of the kernel src.
83 # Use "make O=dir/to/store/output/files/"
85 # 2) Set KBUILD_OUTPUT
86 # Set the environment variable KBUILD_OUTPUT to point to the directory
87 # where the output files shall be placed.
88 # export KBUILD_OUTPUT=dir/to/store/output/files/
91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
95 # KBUILD_SRC is set on invocation of make in OBJ directory
96 # KBUILD_SRC is not intended to be used by the regular user (for now)
99 # OK, Make called in directory where kernel src resides
100 # Do we want to locate output files in a separate directory?
102 ifeq ("$(origin O)", "command line")
103 KBUILD_OUTPUT := $(O)
107 # That's our default target when none is given on the command line
111 # Cancel implicit rules on top Makefile
112 $(CURDIR)/Makefile Makefile: ;
114 ifneq ($(KBUILD_OUTPUT),)
115 # Invoke a second make in the output directory, passing relevant variables
116 # check that the output directory actually exists
117 saved-output := $(KBUILD_OUTPUT)
118 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
119 $(if $(KBUILD_OUTPUT),, \
120 $(error output directory "$(saved-output)" does not exist))
122 PHONY += $(MAKECMDGOALS) sub-make
124 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
128 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
129 KBUILD_SRC=$(CURDIR) \
130 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
131 $(filter-out _all sub-make,$(MAKECMDGOALS))
133 # Leave processing to above invocation of make
135 endif # ifneq ($(KBUILD_OUTPUT),)
136 endif # ifeq ($(KBUILD_SRC),)
138 # We process the rest of the Makefile if this is the final invocation of make
139 ifeq ($(skip-makefile),)
141 # If building an external module we do not care about the all: rule
142 # but instead _all depend on modules
144 ifeq ($(KBUILD_EXTMOD),)
150 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
152 # FIXME - TOPDIR is obsolete, use srctree/objtree
157 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
159 export srctree objtree VPATH TOPDIR
162 # SUBARCH tells the usermode build what the underlying arch is. That is set
163 # first, and if a usermode build is happening, the "ARCH=um" on the command
164 # line overrides the setting of ARCH below. If a native build is happening,
165 # then ARCH is assigned, getting whatever value it gets normally, and
166 # SUBARCH is subsequently ignored.
168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
169 -e s/arm.*/arm/ -e s/sa110/arm/ \
170 -e s/s390x/s390/ -e s/parisc64/parisc/ \
171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
174 # Cross compiling and selecting different set of gcc/bin-utils
175 # ---------------------------------------------------------------------------
177 # When performing cross compilation for other architectures ARCH shall be set
178 # to the target architecture. (See arch/* for the possibilities).
179 # ARCH can be set during invocation of make:
181 # Another way is to have ARCH set in the environment.
182 # The default ARCH is the host where make is executed.
184 # CROSS_COMPILE specify the prefix used for all executables used
185 # during compilation. Only gcc and related bin-utils executables
186 # are prefixed with $(CROSS_COMPILE).
187 # CROSS_COMPILE can be set on the command line
188 # make CROSS_COMPILE=ia64-linux-
189 # Alternatively CROSS_COMPILE can be set in the environment.
190 # Default value for CROSS_COMPILE is not to prefix executables
191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
192 export KBUILD_BUILDHOST := $(SUBARCH)
196 # Architecture as present in compile.h
197 UTS_MACHINE := $(ARCH)
200 # Additional ARCH settings for x86
204 ifeq ($(ARCH),x86_64)
208 # Additional ARCH settings for sparc
209 ifeq ($(ARCH),sparc64)
213 # Additional ARCH settings for sh
218 # Where to locate arch specific headers
219 hdr-arch := $(SRCARCH)
221 ifeq ($(ARCH),m68knommu)
225 KCONFIG_CONFIG ?= .config
227 # SHELL used by kbuild
228 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
229 else if [ -x /bin/bash ]; then echo /bin/bash; \
230 else echo sh; fi ; fi)
234 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
237 # Decide whether to build built-in, modular, or both.
238 # Normally, just do built-in.
243 # If we have only "make modules", don't compile built-in objects.
244 # When we're building modules with modversions, we need to consider
245 # the built-in objects during the descend as well, in order to
246 # make sure the checksums are up to date before we record them.
248 ifeq ($(MAKECMDGOALS),modules)
249 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
252 # If we have "make <whatever> modules", compile modules
253 # in addition to whatever we do anyway.
254 # Just "make" or "make all" shall build modules as well
256 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
260 ifeq ($(MAKECMDGOALS),)
264 export KBUILD_MODULES KBUILD_BUILTIN
265 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
268 # ---------------------------------------------------------------------------
270 # Normally, we echo the whole command before executing it. By making
271 # that echo $($(quiet)$(cmd)), we now have the possibility to set
272 # $(quiet) to choose other forms of output instead, e.g.
274 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
275 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
277 # If $(quiet) is empty, the whole command will be printed.
278 # If it is set to "quiet_", only the short version will be printed.
279 # If it is set to "silent_", nothing will be printed at all, since
280 # the variable $(silent_cmd_cc_o_c) doesn't exist.
282 # A simple variant is to prefix commands with $(Q) - that's useful
283 # for commands that shall be hidden in non-verbose mode.
287 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
288 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
290 ifeq ($(KBUILD_VERBOSE),1)
298 # If the user is running make -s (silent mode), suppress echoing of
301 ifneq ($(findstring s,$(MAKEFLAGS)),)
305 export quiet Q KBUILD_VERBOSE
308 # Look for make include files relative to root of kernel src
309 MAKEFLAGS += --include-dir=$(srctree)
311 # We need some generic definitions (do not try to remake the file).
312 $(srctree)/scripts/Kbuild.include: ;
313 include $(srctree)/scripts/Kbuild.include
315 # Make variables (CC, etc...)
317 AS = $(CROSS_COMPILE)as
318 LD = $(CROSS_COMPILE)ld
319 CC = $(CROSS_COMPILE)gcc
321 AR = $(CROSS_COMPILE)ar
322 NM = $(CROSS_COMPILE)nm
323 STRIP = $(CROSS_COMPILE)strip
324 OBJCOPY = $(CROSS_COMPILE)objcopy
325 OBJDUMP = $(CROSS_COMPILE)objdump
327 GENKSYMS = scripts/genksyms/genksyms
328 DEPMOD = /sbin/depmod
329 KALLSYMS = scripts/kallsyms
333 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
334 -Wbitwise -Wno-return-void $(CF)
336 CFLAGS_MODULE = $(MODFLAGS)
337 AFLAGS_MODULE = $(MODFLAGS)
343 # Use LINUXINCLUDE when you must reference the include/ directory.
344 # Needed to be compatible with the O= option
345 LINUXINCLUDE := -Iinclude \
346 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
347 -I$(srctree)/arch/$(hdr-arch)/include \
348 -include include/linux/autoconf.h
350 KBUILD_CPPFLAGS := -D__KERNEL__
352 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
353 -fno-strict-aliasing -fno-common \
354 -Werror-implicit-function-declaration
355 KBUILD_AFLAGS := -D__ASSEMBLY__
357 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
358 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
359 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
361 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
362 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
363 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
364 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
366 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
367 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
368 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
370 # When compiling out-of-tree modules, put MODVERDIR in the module
371 # tree rather than in the kernel tree. The kernel tree might
373 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
375 # Files to ignore in find ... statements
377 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
378 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
380 # ===========================================================================
381 # Rules shared between *config targets and build targets
383 # Basic helpers built in scripts/
384 PHONY += scripts_basic
386 $(Q)$(MAKE) $(build)=scripts/basic
388 # To avoid any implicit rule to kick in, define an empty command.
389 scripts/basic/%: scripts_basic ;
391 PHONY += outputmakefile
392 # outputmakefile generates a Makefile in the output directory, if using a
393 # separate output directory. This allows convenient use of make in the
396 ifneq ($(KBUILD_SRC),)
397 $(Q)ln -fsn $(srctree) source
398 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
399 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
402 # To make sure we do not include .config for any of the *config targets
403 # catch them early, and hand them over to scripts/kconfig/Makefile
404 # It is allowed to specify more targets when calling make, including
405 # mixing *config targets and build targets.
406 # For example 'make oldconfig all'.
407 # Detect when mixed targets is specified, and make a second invocation
408 # of make so .config is not included in this case either (for *config).
410 no-dot-config-targets := clean mrproper distclean \
411 cscope TAGS tags help %docs check% \
412 include/linux/version.h headers_% \
413 kernelrelease kernelversion
419 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
420 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
425 ifeq ($(KBUILD_EXTMOD),)
426 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
428 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
434 ifeq ($(mixed-targets),1)
435 # ===========================================================================
436 # We're called with mixed targets (*config and build targets).
437 # Handle them one by one.
440 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
443 ifeq ($(config-targets),1)
444 # ===========================================================================
445 # *config targets only - make sure prerequisites are updated, and descend
446 # in scripts/kconfig to make the *config target
448 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
449 # KBUILD_DEFCONFIG may point out an alternative default configuration
450 # used for 'make defconfig'
451 include $(srctree)/arch/$(SRCARCH)/Makefile
452 export KBUILD_DEFCONFIG KBUILD_KCONFIG
454 config: scripts_basic outputmakefile FORCE
455 $(Q)mkdir -p include/linux include/config
456 $(Q)$(MAKE) $(build)=scripts/kconfig $@
458 %config: scripts_basic outputmakefile FORCE
459 $(Q)mkdir -p include/linux include/config
460 $(Q)$(MAKE) $(build)=scripts/kconfig $@
463 # ===========================================================================
464 # Build targets only - this includes vmlinux, arch specific targets, clean
465 # targets and others. In general all targets except *config targets.
467 ifeq ($(KBUILD_EXTMOD),)
468 # Additional helpers built in scripts/
469 # Carefully list dependencies so we do not try to build scripts twice
472 scripts: scripts_basic include/config/auto.conf
473 $(Q)$(MAKE) $(build)=$(@)
475 # Objects we will link into vmlinux / subdirs we need to visit
477 drivers-y := drivers/ sound/ firmware/
481 endif # KBUILD_EXTMOD
483 ifeq ($(dot-config),1)
485 -include include/config/auto.conf
487 ifeq ($(KBUILD_EXTMOD),)
488 # Read in dependencies to all Kconfig* files, make sure to run
489 # oldconfig if changes are detected.
490 -include include/config/auto.conf.cmd
492 # To avoid any implicit rule to kick in, define an empty command
493 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
495 # If .config is newer than include/config/auto.conf, someone tinkered
496 # with it and forgot to run make oldconfig.
497 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
498 # we execute the config step to be sure to catch updated Kconfig files
499 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
500 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
502 # external modules needs include/linux/autoconf.h and include/config/auto.conf
503 # but do not care if they are up-to-date. Use auto.conf to trigger the test
504 PHONY += include/config/auto.conf
506 include/config/auto.conf:
507 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
509 echo " ERROR: Kernel configuration is invalid."; \
510 echo " include/linux/autoconf.h or $@ are missing."; \
511 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
515 endif # KBUILD_EXTMOD
518 # Dummy target needed, because used as prerequisite
519 include/config/auto.conf: ;
520 endif # $(dot-config)
522 # The all: target is the default when no target is given on the
524 # This allow a user to issue only 'make' to build a kernel including modules
525 # Defaults vmlinux but it is usually overridden in the arch makefile
528 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
534 include $(srctree)/arch/$(SRCARCH)/Makefile
536 ifneq (CONFIG_FRAME_WARN,0)
537 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
540 # Force gcc to behave correct even for buggy distributions
541 ifndef CONFIG_CC_STACKPROTECTOR
542 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
545 ifdef CONFIG_FRAME_POINTER
546 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
548 KBUILD_CFLAGS += -fomit-frame-pointer
551 ifdef CONFIG_DEBUG_INFO
553 KBUILD_AFLAGS += -gdwarf-2
556 ifdef CONFIG_FUNCTION_TRACER
560 # We trigger additional mismatches with less inlining
561 ifdef CONFIG_DEBUG_SECTION_MISMATCH
562 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
565 # arch Makefile may override CC so keep this after arch Makefile is included
566 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
567 CHECKFLAGS += $(NOSTDINC_FLAGS)
569 # warn about C99 declaration after statement
570 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
572 # disable pointer signed / unsigned warnings in gcc 4.0
573 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
575 # disable invalid "can't wrap" optimzations for signed / pointers
576 KBUILD_CFLAGS += $(call cc-option,-fwrapv)
578 # revert to pre-gcc-4.4 behaviour of .eh_frame
579 KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
581 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
582 # But warn user when we do so
584 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
586 ifneq ($(KCPPFLAGS),)
587 $(call warn-assign,CPPFLAGS)
588 KBUILD_CPPFLAGS += $(KCPPFLAGS)
591 $(call warn-assign,AFLAGS)
592 KBUILD_AFLAGS += $(KAFLAGS)
595 $(call warn-assign,CFLAGS)
596 KBUILD_CFLAGS += $(KCFLAGS)
599 # Use --build-id when available.
600 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
601 $(call ld-option, -Wl$(comma)--build-id,))
602 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
603 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
605 # Default kernel image to build when no specific target is given.
606 # KBUILD_IMAGE may be overruled on the command line or
607 # set in the environment
608 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
610 export KBUILD_IMAGE ?= vmlinux
613 # INSTALL_PATH specifies where to place the updated kernel and system map
614 # images. Default is /boot, but you can set it to other values
615 export INSTALL_PATH ?= /boot
618 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
619 # relocations required by build roots. This is not defined in the
620 # makefile but the argument can be passed to make if needed.
623 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
627 # INSTALL_MOD_STRIP, if defined, will cause modules to be
628 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
629 # the default option --strip-debug will be used. Otherwise,
630 # INSTALL_MOD_STRIP will used as the options to the strip command.
632 ifdef INSTALL_MOD_STRIP
633 ifeq ($(INSTALL_MOD_STRIP),1)
634 mod_strip_cmd = $(STRIP) --strip-debug
636 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
637 endif # INSTALL_MOD_STRIP=1
640 endif # INSTALL_MOD_STRIP
644 ifeq ($(KBUILD_EXTMOD),)
645 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
647 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
648 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
649 $(net-y) $(net-m) $(libs-y) $(libs-m)))
651 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
653 $(core-n) $(core-) $(drivers-n) $(drivers-) \
654 $(net-n) $(net-) $(libs-n) $(libs-))))
656 init-y := $(patsubst %/, %/built-in.o, $(init-y))
657 core-y := $(patsubst %/, %/built-in.o, $(core-y))
658 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
659 net-y := $(patsubst %/, %/built-in.o, $(net-y))
660 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
661 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
662 libs-y := $(libs-y1) $(libs-y2)
665 # ---------------------------------------------------------------------------
666 # vmlinux is built from the objects selected by $(vmlinux-init) and
667 # $(vmlinux-main). Most are built-in.o files from top-level directories
668 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
669 # Ordering when linking is important, and $(vmlinux-init) must be first.
674 # +-< $(vmlinux-init)
675 # | +--< init/version.o + more
677 # +--< $(vmlinux-main)
678 # | +--< driver/built-in.o mm/built-in.o + more
680 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
682 # vmlinux version (uname -v) cannot be updated during normal
683 # descending-into-subdirs phase since we do not yet know if we need to
685 # Therefore this step is delayed until just before final link of vmlinux -
686 # except in the kallsyms case where it is done just before adding the
687 # symbols to the kernel.
689 # System.map is generated to document addresses of all kernel symbols
691 vmlinux-init := $(head-y) $(init-y)
692 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
693 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
694 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
695 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
697 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
698 # May be overridden by arch/$(ARCH)/Makefile
699 quiet_cmd_vmlinux__ ?= LD $@
700 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
701 -T $(vmlinux-lds) $(vmlinux-init) \
702 --start-group $(vmlinux-main) --end-group \
703 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
705 # Generate new vmlinux version
706 quiet_cmd_vmlinux_version = GEN .version
707 cmd_vmlinux_version = set -e; \
708 if [ ! -r .version ]; then \
712 mv .version .old_version; \
713 expr 0$$(cat .old_version) + 1 >.version; \
715 $(MAKE) $(build)=init
717 # Generate System.map
718 quiet_cmd_sysmap = SYSMAP
719 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
722 # If CONFIG_KALLSYMS is set .version is already updated
723 # Generate System.map and verify that the content is consistent
724 # Use + in front of the vmlinux_version rule to silent warning with make -j2
725 # First command is ':' to allow us to use + in front of the rule
726 define rule_vmlinux__
728 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
730 $(call cmd,vmlinux__)
731 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
733 $(Q)$(if $($(quiet)cmd_sysmap), \
734 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
735 $(cmd_sysmap) $@ System.map; \
736 if [ $$? -ne 0 ]; then \
744 ifdef CONFIG_KALLSYMS
745 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
746 # It's a three stage process:
747 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
749 # Running kallsyms on that gives us .tmp_kallsyms1.o with
750 # the right size - vmlinux version (uname -v) is updated during this step
751 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
752 # but due to the added section, some addresses have shifted.
753 # From here, we generate a correct .tmp_kallsyms2.o
754 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
755 # o Verify that the System.map from vmlinux matches the map from
756 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
757 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
758 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
759 # temporary bypass to allow the kernel to be built while the
760 # maintainers work out what went wrong with kallsyms.
762 ifdef CONFIG_KALLSYMS_EXTRA_PASS
768 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
770 define verify_kallsyms
771 $(Q)$(if $($(quiet)cmd_sysmap), \
772 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
773 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
774 $(Q)cmp -s System.map .tmp_System.map || \
775 (echo Inconsistent kallsyms data; \
776 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
777 rm .tmp_kallsyms* ; /bin/false )
780 # Update vmlinux version before link
781 # Use + in front of this rule to silent warning about make -j1
782 # First command is ':' to allow us to use + in front of this rule
783 cmd_ksym_ld = $(cmd_vmlinux__)
786 +$(call cmd,vmlinux_version)
787 $(call cmd,vmlinux__)
788 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
791 # Generate .S file with all kernel symbols
792 quiet_cmd_kallsyms = KSYM $@
793 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
794 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
796 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
797 $(call if_changed_dep,as_o_S)
799 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
802 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
803 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
804 $(call if_changed_rule,ksym_ld)
806 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
807 $(call if_changed,vmlinux__)
809 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
810 $(call if_changed,vmlinux__)
812 # Needs to visit scripts/ before $(KALLSYMS) can be used.
813 $(KALLSYMS): scripts ;
815 # Generate some data for debugging strange kallsyms problems
816 debug_kallsyms: .tmp_map$(last_kallsyms)
818 .tmp_map%: .tmp_vmlinux% FORCE
819 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
825 endif # ifdef CONFIG_KALLSYMS
827 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
828 # relevant sections renamed as per the linker script.
829 quiet_cmd_vmlinux-modpost = LD $@
830 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
831 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
832 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
833 define rule_vmlinux-modpost
835 +$(call cmd,vmlinux-modpost)
836 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
837 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
840 # vmlinux image - including updated kernel symbols
841 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
842 ifdef CONFIG_HEADERS_CHECK
843 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
846 $(Q)$(MAKE) $(build)=samples
848 ifdef CONFIG_BUILD_DOCSRC
849 $(Q)$(MAKE) $(build)=Documentation
851 $(call vmlinux-modpost)
852 $(call if_changed_rule,vmlinux__)
853 $(Q)rm -f .old_version
855 # build vmlinux.o first to catch section mismatch errors early
856 ifdef CONFIG_KALLSYMS
857 .tmp_vmlinux1: vmlinux.o
860 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
861 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
862 $(call if_changed_rule,vmlinux-modpost)
864 # The actual objects are generated when descending,
865 # make sure no implicit rule kicks in
866 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
868 # Handle descending into subdirectories listed in $(vmlinux-dirs)
869 # Preset locale variables to speed up the build process. Limit locale
870 # tweaks to this spot to avoid wrong language settings when running
871 # make menuconfig etc.
872 # Error messages still appears in the original language
874 PHONY += $(vmlinux-dirs)
875 $(vmlinux-dirs): prepare scripts
876 $(Q)$(MAKE) $(build)=$@
878 # Build the kernel release string
880 # The KERNELRELEASE value built here is stored in the file
881 # include/config/kernel.release, and is used when executing several
882 # make targets, such as "make install" or "make modules_install."
884 # The eventual kernel release string consists of the following fields,
885 # shown in a hierarchical format to show how smaller parts are concatenated
886 # to form the larger and final value, with values coming from places like
887 # the Makefile, kernel config options, make command line options and/or
888 # SCM tag information.
892 # $(PATCHLEVEL) eg, 6
894 # $(EXTRAVERSION) eg, -rc6
897 # localversion* (files without backups, containing '~')
898 # $(CONFIG_LOCALVERSION) (from kernel config setting)
899 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
900 # ./scripts/setlocalversion (SCM tag, if one exists)
901 # $(LOCALVERSION) (from make command line if provided)
903 # Note how the final $(localver-auto) string is included *only* if the
904 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
905 # moment, only git is supported but other SCMs can edit the script
906 # scripts/setlocalversion and add the appropriate checks as needed.
908 pattern = ".*/localversion[^~]*"
909 string = $(shell cat /dev/null \
910 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
912 localver = $(subst $(space),, $(string) \
913 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
915 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
916 # and if the SCM is know a tag from the SCM is appended.
917 # The appended tag is determined by the SCM used.
919 # .scmversion is used when generating rpm packages so we do not loose
920 # the version information from the SCM when we do the build of the kernel
921 # from the copied source
922 ifdef CONFIG_LOCALVERSION_AUTO
924 ifeq ($(wildcard .scmversion),)
925 _localver-auto = $(shell $(CONFIG_SHELL) \
926 $(srctree)/scripts/setlocalversion $(srctree))
928 _localver-auto = $(shell cat .scmversion 2> /dev/null)
931 localver-auto = $(LOCALVERSION)$(_localver-auto)
934 localver-full = $(localver)$(localver-auto)
936 # Store (new) KERNELRELASE string in include/config/kernel.release
937 kernelrelease = $(KERNELVERSION)$(localver-full)
938 include/config/kernel.release: include/config/auto.conf FORCE
940 $(Q)echo $(kernelrelease) > $@
943 # Things we need to do before we recursively start building the kernel
944 # or the modules are listed in "prepare".
945 # A multi level approach is used. prepareN is processed before prepareN-1.
946 # archprepare is used in arch Makefiles and when processed asm symlink,
947 # version.h and scripts_basic is processed / created.
949 # Listed in dependency order
950 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
952 # prepare3 is used to check if we are building in a separate output directory,
954 # 1) Check that make has not been executed in the kernel src $(srctree)
955 # 2) Create the include2 directory, used for the second asm symlink
956 prepare3: include/config/kernel.release
957 ifneq ($(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.";\
964 $(Q)if [ ! -d include2 ]; then \
966 ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm; \
970 # prepare2 creates a makefile if using a separate output directory
971 prepare2: prepare3 outputmakefile
973 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
974 include/asm include/config/auto.conf
977 archprepare: prepare1 scripts_basic
979 prepare0: archprepare FORCE
980 $(Q)$(MAKE) $(build)=.
981 $(Q)$(MAKE) $(build)=. missing-syscalls
983 # All the preparing..
986 # Leave this as default for preprocessing vmlinux.lds.S, which is now
987 # done in arch/$(ARCH)/kernel/Makefile
989 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
991 # The asm symlink changes when $(ARCH) changes.
992 # Detect this and ask user to run make mrproper
993 # If asm is a stale symlink (point to dir that does not exist) remove it
996 if [ -L include/asm ]; then \
997 asmlink=`readlink include/asm | cut -d '-' -f 2`; \
998 if [ "$$asmlink" != "$(SRCARCH)" ]; then \
999 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
1000 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
1003 test -e $$asmlink || rm include/asm; \
1004 elif [ -d include/asm ]; then \
1005 echo "ERROR: $@ is a directory but a symlink was expected";\
1010 # We create the target directory of the symlink if it does
1011 # not exist so the test in check-symlink works and we have a
1012 # directory for generated filesas used by some architectures.
1013 define create-symlink
1014 if [ ! -L include/asm ]; then \
1015 $(kecho) ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1016 if [ ! -d include/asm-$(SRCARCH) ]; then \
1017 mkdir -p include/asm-$(SRCARCH); \
1019 ln -fsn asm-$(SRCARCH) $@; \
1024 $(Q)$(check-symlink)
1025 $(Q)$(create-symlink)
1027 # Generate some files
1028 # ---------------------------------------------------------------------------
1030 # KERNELRELEASE can change from a few different places, meaning version.h
1031 # needs to be updated, so this check is forced on all builds
1034 define filechk_utsrelease.h
1035 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1036 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1039 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1042 define filechk_version.h
1043 (echo \#define LINUX_VERSION_CODE $(shell \
1044 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1045 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1048 include/linux/version.h: $(srctree)/Makefile FORCE
1049 $(call filechk,version.h)
1051 include/linux/utsrelease.h: include/config/kernel.release FORCE
1052 $(call filechk,utsrelease.h)
1056 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1058 # ---------------------------------------------------------------------------
1062 @echo '*** Warning: make $@ is unnecessary now.'
1064 # ---------------------------------------------------------------------------
1066 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1067 export INSTALL_FW_PATH
1069 PHONY += firmware_install
1070 firmware_install: FORCE
1071 @mkdir -p $(objtree)/firmware
1072 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1074 # ---------------------------------------------------------------------------
1077 #Default location for installed headers
1078 export INSTALL_HDR_PATH = $(objtree)/usr
1080 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1081 # Find out where the Kbuild file is located to support
1082 # arch/$(ARCH)/include/asm
1084 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1085 arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1087 # If we do an all arch process set dst to asm-$(hdr-arch)
1088 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1091 __headers: include/linux/version.h scripts_basic FORCE
1092 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1094 PHONY += headers_install_all
1095 headers_install_all:
1096 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1098 PHONY += headers_install
1099 headers_install: __headers
1100 $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1101 $(error Headers not exportable for the $(SRCARCH) architecture))
1102 $(Q)$(MAKE) $(hdr-inst)=include
1103 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1105 PHONY += headers_check_all
1106 headers_check_all: headers_install_all
1107 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1109 PHONY += headers_check
1110 headers_check: headers_install
1111 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1112 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1114 # ---------------------------------------------------------------------------
1117 ifdef CONFIG_MODULES
1119 # By default, build modules as well
1125 # A module can be listed more than once in obj-m resulting in
1126 # duplicate lines in modules.order files. Those are removed
1127 # using awk while concatenating to the final file.
1130 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1131 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1132 @$(kecho) ' Building modules, stage 2.';
1133 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1134 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1137 # Target to prepare building external modules
1138 PHONY += modules_prepare
1139 modules_prepare: prepare scripts
1141 # Target to install modules
1142 PHONY += modules_install
1143 modules_install: _modinst_ _modinst_post
1147 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1148 echo "Warning: you may need to install module-init-tools"; \
1149 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1152 @rm -rf $(MODLIB)/kernel
1153 @rm -f $(MODLIB)/source
1154 @mkdir -p $(MODLIB)/kernel
1155 @ln -s $(srctree) $(MODLIB)/source
1156 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1157 rm -f $(MODLIB)/build ; \
1158 ln -s $(objtree) $(MODLIB)/build ; \
1160 @cp -f $(objtree)/modules.order $(MODLIB)/
1161 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1163 # This depmod is only for convenience to give the initial
1164 # boot a modules.dep even before / is mounted read-write. However the
1165 # boot script depmod is the master version.
1166 PHONY += _modinst_post
1167 _modinst_post: _modinst_
1168 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1171 else # CONFIG_MODULES
1173 # Modules not configured
1174 # ---------------------------------------------------------------------------
1176 modules modules_install: FORCE
1178 @echo "The present kernel configuration has modules disabled."
1179 @echo "Type 'make config' and enable loadable module support."
1180 @echo "Then build a kernel with module support enabled."
1184 endif # CONFIG_MODULES
1187 # Cleaning is done on three levels.
1188 # make clean Delete most generated files
1189 # Leave enough to build external modules
1190 # make mrproper Delete the current configuration, and all generated files
1191 # make distclean Remove editor backup files, patch leftover files and the like
1193 # Directories & files removed with 'make clean'
1194 CLEAN_DIRS += $(MODVERDIR)
1195 CLEAN_FILES += vmlinux System.map \
1196 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1198 # Directories & files removed with 'make mrproper'
1199 MRPROPER_DIRS += include/config include2 usr/include
1200 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1201 include/linux/autoconf.h include/linux/version.h \
1202 include/linux/utsrelease.h \
1203 include/linux/bounds.h include/asm*/asm-offsets.h \
1204 Module.symvers Module.markers tags TAGS cscope*
1206 # clean - Delete most, but leave enough to build external modules
1208 clean: rm-dirs := $(CLEAN_DIRS)
1209 clean: rm-files := $(CLEAN_FILES)
1210 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1212 PHONY += $(clean-dirs) clean archclean
1214 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1216 clean: archclean $(clean-dirs)
1219 @find . $(RCS_FIND_IGNORE) \
1220 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1221 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1222 -o -name '*.symtypes' -o -name 'modules.order' \
1223 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
1224 -type f -print | xargs rm -f
1226 # mrproper - Delete all generated files, including .config
1228 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1229 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1230 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1232 PHONY += $(mrproper-dirs) mrproper archmrproper
1234 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1236 mrproper: clean archmrproper $(mrproper-dirs)
1245 @find $(srctree) $(RCS_FIND_IGNORE) \
1246 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1247 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1248 -o -name '.*.rej' -o -size 0 \
1249 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1250 -type f -print | xargs rm -f
1253 # Packaging of the kernel to various formats
1254 # ---------------------------------------------------------------------------
1255 # rpm target kept for backward compatibility
1256 package-dir := $(srctree)/scripts/package
1258 %pkg: include/config/kernel.release FORCE
1259 $(Q)$(MAKE) $(build)=$(package-dir) $@
1260 rpm: include/config/kernel.release FORCE
1261 $(Q)$(MAKE) $(build)=$(package-dir) $@
1264 # Brief documentation of the typical targets used
1265 # ---------------------------------------------------------------------------
1267 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1268 boards := $(notdir $(boards))
1269 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1270 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1273 @echo 'Cleaning targets:'
1274 @echo ' clean - Remove most generated files but keep the config and'
1275 @echo ' enough build support to build external modules'
1276 @echo ' mrproper - Remove all generated files + config + various backup files'
1277 @echo ' distclean - mrproper + remove editor backup and patch files'
1279 @echo 'Configuration targets:'
1280 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1282 @echo 'Other generic targets:'
1283 @echo ' all - Build all targets marked with [*]'
1284 @echo '* vmlinux - Build the bare kernel'
1285 @echo '* modules - Build all modules'
1286 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1287 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1288 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1289 @echo ' dir/ - Build all files in dir and below'
1290 @echo ' dir/file.[ois] - Build specified target only'
1291 @echo ' dir/file.ko - Build module including final link'
1292 @echo ' prepare - Set up for building external modules'
1293 @echo ' tags/TAGS - Generate tags file for editors'
1294 @echo ' cscope - Generate cscope index'
1295 @echo ' kernelrelease - Output the release version string'
1296 @echo ' kernelversion - Output the version stored in Makefile'
1297 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1298 echo ' (default: $(INSTALL_HDR_PATH))'; \
1300 @echo 'Static analysers'
1301 @echo ' checkstack - Generate a list of stack hogs'
1302 @echo ' namespacecheck - Name space analysis on compiled kernel'
1303 @echo ' versioncheck - Sanity check on version.h usage'
1304 @echo ' includecheck - Check for duplicate included header files'
1305 @echo ' export_report - List the usages of all exported symbols'
1306 @echo ' headers_check - Sanity check on exported headers'
1307 @echo ' headerdep - Detect inclusion cycles in headers'; \
1309 @echo 'Kernel packaging:'
1310 @$(MAKE) $(build)=$(package-dir) help
1312 @echo 'Documentation targets:'
1313 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1315 @echo 'Architecture specific targets ($(SRCARCH)):'
1316 @$(if $(archhelp),$(archhelp),\
1317 echo ' No architecture specific help defined for $(SRCARCH)')
1320 $(foreach b, $(boards), \
1321 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1323 @$(if $(board-dirs), \
1324 $(foreach b, $(board-dirs), \
1325 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1326 printf " %-16s - Show all of the above\\n" help-boards; \
1329 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1330 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1331 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1332 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1333 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1335 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1336 @echo 'For further info see the ./README file'
1339 help-board-dirs := $(addprefix help-,$(board-dirs))
1341 help-boards: $(help-board-dirs)
1343 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1345 $(help-board-dirs): help-%:
1346 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1347 @$(if $(boards-per-dir), \
1348 $(foreach b, $(boards-per-dir), \
1349 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1353 # Documentation targets
1354 # ---------------------------------------------------------------------------
1355 %docs: scripts_basic FORCE
1356 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1358 else # KBUILD_EXTMOD
1361 # External module support.
1362 # When building external modules the kernel used as basis is considered
1363 # read-only, and no consistency checks are made and the make
1364 # system is not used on the basis kernel. If updates are required
1365 # in the basis kernel ordinary make commands (without M=...) must
1368 # The following are the only valid targets when building external
1370 # make M=dir clean Delete all automatically generated files
1371 # make M=dir modules Make all modules in specified dir
1372 # make M=dir Same as 'make M=dir modules'
1373 # make M=dir modules_install
1374 # Install the modules built in the module directory
1375 # Assumes install directory is already created
1377 # We are always building modules
1379 PHONY += crmodverdir
1383 PHONY += $(objtree)/Module.symvers
1384 $(objtree)/Module.symvers:
1385 @test -e $(objtree)/Module.symvers || ( \
1387 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1388 echo " is missing; modules will have no dependencies and modversions."; \
1391 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1392 PHONY += $(module-dirs) modules
1393 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1394 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1396 modules: $(module-dirs)
1397 @$(kecho) ' Building modules, stage 2.';
1398 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1400 PHONY += modules_install
1401 modules_install: _emodinst_ _emodinst_post
1403 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1406 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1407 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1409 PHONY += _emodinst_post
1410 _emodinst_post: _emodinst_
1413 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1415 PHONY += $(clean-dirs) clean
1417 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1419 clean: rm-dirs := $(MODVERDIR)
1420 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1421 clean: $(clean-dirs)
1424 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1425 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1426 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1427 -type f -print | xargs rm -f
1430 @echo ' Building external modules.'
1431 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1433 @echo ' modules - default target, build the module(s)'
1434 @echo ' modules_install - install the module'
1435 @echo ' clean - remove generated files in module directory only'
1439 PHONY += prepare scripts
1442 endif # KBUILD_EXTMOD
1444 # Generate tags for editors
1445 # ---------------------------------------------------------------------------
1446 quiet_cmd_tags = GEN $@
1447 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1449 tags TAGS cscope: FORCE
1452 # Scripts to check various things for consistency
1453 # ---------------------------------------------------------------------------
1456 find * $(RCS_FIND_IGNORE) \
1457 -name '*.[hcS]' -type f -print | sort \
1458 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1461 find * $(RCS_FIND_IGNORE) \
1462 -name '*.[hcS]' -type f -print | sort \
1463 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1466 $(PERL) $(srctree)/scripts/namespace.pl
1469 $(PERL) $(srctree)/scripts/export_report.pl
1471 endif #ifeq ($(config-targets),1)
1472 endif #ifeq ($(mixed-targets),1)
1474 PHONY += checkstack kernelrelease kernelversion
1476 # UML needs a little special treatment here. It wants to use the host
1477 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1478 # else wants $(ARCH), including people doing cross-builds, which means
1479 # that $(SUBARCH) doesn't work here.
1481 CHECKSTACK_ARCH := $(SUBARCH)
1483 CHECKSTACK_ARCH := $(ARCH)
1486 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1487 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1490 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1491 $(error kernelrelease not valid - run 'make prepare' to update it))
1493 @echo $(KERNELVERSION)
1496 # ---------------------------------------------------------------------------
1497 # Single targets are compatible with:
1498 # - build with mixed source and output
1499 # - build with separate output dir 'make O=...'
1500 # - external modules
1502 # target-dir => where to store outputfile
1503 # build-dir => directory in kernel source tree to use
1505 ifeq ($(KBUILD_EXTMOD),)
1506 build-dir = $(patsubst %/,%,$(dir $@))
1507 target-dir = $(dir $@)
1509 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1510 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1511 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1514 %.s: %.c prepare scripts FORCE
1515 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1516 %.i: %.c prepare scripts FORCE
1517 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1518 %.o: %.c prepare scripts FORCE
1519 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1520 %.lst: %.c prepare scripts FORCE
1521 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1522 %.s: %.S prepare scripts FORCE
1523 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1524 %.o: %.S prepare scripts FORCE
1525 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526 %.symtypes: %.c prepare scripts FORCE
1527 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1530 /: prepare scripts FORCE
1532 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1533 $(build)=$(build-dir)
1534 %/: prepare scripts FORCE
1536 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1537 $(build)=$(build-dir)
1538 %.ko: prepare scripts FORCE
1540 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1541 $(build)=$(build-dir) $(@:.ko=.o)
1542 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1544 # FIXME Should go into a make.lib or something
1545 # ===========================================================================
1547 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1548 cmd_rmdirs = rm -rf $(rm-dirs)
1550 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1551 cmd_rmfiles = rm -f $(rm-files)
1553 # Run depmod only if we have System.map and depmod is executable
1554 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1556 if [ -r System.map -a -x $(DEPMOD) ]; then \
1557 $(DEPMOD) -ae -F System.map \
1558 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1562 # Create temporary dir for module support files
1563 # clean it up only when building all modules
1564 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1565 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1567 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1568 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1569 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1571 quiet_cmd_as_o_S = AS $@
1572 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1574 # read all saved command lines
1576 targets := $(wildcard $(sort $(targets)))
1577 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1579 ifneq ($(cmd_files),)
1580 $(cmd_files): ; # Do not try to update included dependency files
1581 include $(cmd_files)
1584 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1586 # $(Q)$(MAKE) $(clean)=dir
1587 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1589 endif # skip-makefile
1594 # Declare the contents of the .PHONY variable as phony. We keep that
1595 # information in a variable se we can use it in if_changed and friends.