5 NAME = Arr Matey! A Hairy Bilge Rat!
8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
14 # o use make's built-in rules and variables
15 # (this increases performance and avoid hard-to-debug behavour);
16 # o print "Entering directory ...";
17 MAKEFLAGS += -rR --no-print-directory
19 # We are using a recursive build, so we need to do a little thinking
20 # to get the ordering right.
22 # Most importantly: sub-Makefiles should only ever modify files in
23 # their own directory. If in some directory we have a dependency on
24 # a file in another dir (which doesn't happen often, but it's often
25 # unavoidable when linking the built-in.o targets which finally
26 # turn into vmlinux), we will call a sub make in that other dir, and
27 # after that we are sure that everything which is in that other dir
30 # The only cases where we need to modify files which have global
31 # effects are thus separated out and done before the recursive
32 # descending is started. They are now explicitly listed as the
35 # To put more focus on warnings, be less verbose as default
36 # Use 'make V=1' to see the full commands
39 ifeq ("$(origin V)", "command line")
47 # Call a source code checker (by default, "sparse") as part of the
50 # Use 'make C=1' to enable checking of only re-compiled files.
51 # Use 'make C=2' to enable checking of *all* source files, regardless
52 # of whether they are re-compiled or not.
54 # See the file "Documentation/sparse.txt" for more details, including
55 # where to get the "sparse" utility.
58 ifeq ("$(origin C)", "command line")
59 KBUILD_CHECKSRC = $(C)
62 ifndef KBUILD_CHECKSRC
66 # Use make M=dir to specify directory of external module to build
67 # Old syntax make ... SUBDIRS=$PWD is still supported
68 # Setting the environment variable KBUILD_EXTMOD take precedence
70 KBUILD_EXTMOD ?= $(SUBDIRS)
73 ifeq ("$(origin M)", "command line")
79 # kbuild supports saving output files in a separate directory.
80 # To locate output files in a separate directory two syntaxes are supported.
81 # In both cases the working directory must be the root of the kernel src.
83 # Use "make O=dir/to/store/output/files/"
85 # 2) Set KBUILD_OUTPUT
86 # Set the environment variable KBUILD_OUTPUT to point to the directory
87 # where the output files shall be placed.
88 # export KBUILD_OUTPUT=dir/to/store/output/files/
91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
95 # KBUILD_SRC is set on invocation of make in OBJ directory
96 # KBUILD_SRC is not intended to be used by the regular user (for now)
99 # OK, Make called in directory where kernel src resides
100 # Do we want to locate output files in a separate directory?
102 ifeq ("$(origin O)", "command line")
103 KBUILD_OUTPUT := $(O)
107 # That's our default target when none is given on the command line
111 ifneq ($(KBUILD_OUTPUT),)
112 # Invoke a second make in the output directory, passing relevant variables
113 # check that the output directory actually exists
114 saved-output := $(KBUILD_OUTPUT)
115 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
116 $(if $(KBUILD_OUTPUT),, \
117 $(error output directory "$(saved-output)" does not exist))
119 PHONY += $(MAKECMDGOALS)
121 $(filter-out _all,$(MAKECMDGOALS)) _all:
122 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
123 KBUILD_SRC=$(CURDIR) \
124 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
126 # Leave processing to above invocation of make
128 endif # ifneq ($(KBUILD_OUTPUT),)
129 endif # ifeq ($(KBUILD_SRC),)
131 # We process the rest of the Makefile if this is the final invocation of make
132 ifeq ($(skip-makefile),)
134 # If building an external module we do not care about the all: rule
135 # but instead _all depend on modules
137 ifeq ($(KBUILD_EXTMOD),)
143 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
145 # FIXME - TOPDIR is obsolete, use srctree/objtree
150 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
152 export srctree objtree VPATH TOPDIR
155 # SUBARCH tells the usermode build what the underlying arch is. That is set
156 # first, and if a usermode build is happening, the "ARCH=um" on the command
157 # line overrides the setting of ARCH below. If a native build is happening,
158 # then ARCH is assigned, getting whatever value it gets normally, and
159 # SUBARCH is subsequently ignored.
161 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
162 -e s/arm.*/arm/ -e s/sa110/arm/ \
163 -e s/s390x/s390/ -e s/parisc64/parisc/ \
164 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
166 # Cross compiling and selecting different set of gcc/bin-utils
167 # ---------------------------------------------------------------------------
169 # When performing cross compilation for other architectures ARCH shall be set
170 # to the target architecture. (See arch/* for the possibilities).
171 # ARCH can be set during invocation of make:
173 # Another way is to have ARCH set in the environment.
174 # The default ARCH is the host where make is executed.
176 # CROSS_COMPILE specify the prefix used for all executables used
177 # during compilation. Only gcc and related bin-utils executables
178 # are prefixed with $(CROSS_COMPILE).
179 # CROSS_COMPILE can be set on the command line
180 # make CROSS_COMPILE=ia64-linux-
181 # Alternatively CROSS_COMPILE can be set in the environment.
182 # Default value for CROSS_COMPILE is not to prefix executables
183 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
188 # Architecture as present in compile.h
189 UTS_MACHINE := $(ARCH)
192 KCONFIG_CONFIG ?= .config
194 # SHELL used by kbuild
195 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
196 else if [ -x /bin/bash ]; then echo /bin/bash; \
197 else echo sh; fi ; fi)
201 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
204 # Decide whether to build built-in, modular, or both.
205 # Normally, just do built-in.
210 # If we have only "make modules", don't compile built-in objects.
211 # When we're building modules with modversions, we need to consider
212 # the built-in objects during the descend as well, in order to
213 # make sure the checksums are up to date before we record them.
215 ifeq ($(MAKECMDGOALS),modules)
216 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
219 # If we have "make <whatever> modules", compile modules
220 # in addition to whatever we do anyway.
221 # Just "make" or "make all" shall build modules as well
223 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
227 ifeq ($(MAKECMDGOALS),)
231 export KBUILD_MODULES KBUILD_BUILTIN
232 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
235 # ---------------------------------------------------------------------------
237 # Normally, we echo the whole command before executing it. By making
238 # that echo $($(quiet)$(cmd)), we now have the possibility to set
239 # $(quiet) to choose other forms of output instead, e.g.
241 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
242 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
244 # If $(quiet) is empty, the whole command will be printed.
245 # If it is set to "quiet_", only the short version will be printed.
246 # If it is set to "silent_", nothing will be printed at all, since
247 # the variable $(silent_cmd_cc_o_c) doesn't exist.
249 # A simple variant is to prefix commands with $(Q) - that's useful
250 # for commands that shall be hidden in non-verbose mode.
254 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
255 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
257 ifeq ($(KBUILD_VERBOSE),1)
265 # If the user is running make -s (silent mode), suppress echoing of
268 ifneq ($(findstring s,$(MAKEFLAGS)),)
272 export quiet Q KBUILD_VERBOSE
275 # Look for make include files relative to root of kernel src
276 MAKEFLAGS += --include-dir=$(srctree)
278 # We need some generic definitions.
279 include $(srctree)/scripts/Kbuild.include
281 # Make variables (CC, etc...)
283 AS = $(CROSS_COMPILE)as
284 LD = $(CROSS_COMPILE)ld
285 CC = $(CROSS_COMPILE)gcc
287 AR = $(CROSS_COMPILE)ar
288 NM = $(CROSS_COMPILE)nm
289 STRIP = $(CROSS_COMPILE)strip
290 OBJCOPY = $(CROSS_COMPILE)objcopy
291 OBJDUMP = $(CROSS_COMPILE)objdump
293 GENKSYMS = scripts/genksyms/genksyms
294 DEPMOD = /sbin/depmod
295 KALLSYMS = scripts/kallsyms
299 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
301 CFLAGS_MODULE = $(MODFLAGS)
302 AFLAGS_MODULE = $(MODFLAGS)
308 # Use LINUXINCLUDE when you must reference the include/ directory.
309 # Needed to be compatible with the O= option
310 LINUXINCLUDE := -Iinclude \
311 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
312 -include include/linux/autoconf.h
314 CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
316 CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
317 -fno-strict-aliasing -fno-common \
318 -Werror-implicit-function-declaration
319 AFLAGS := -D__ASSEMBLY__
321 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
322 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
323 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
325 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
326 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
327 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
328 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
330 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
331 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
332 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
334 # When compiling out-of-tree modules, put MODVERDIR in the module
335 # tree rather than in the kernel tree. The kernel tree might
337 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
339 # Files to ignore in find ... statements
341 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
342 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
344 # ===========================================================================
345 # Rules shared between *config targets and build targets
347 # Basic helpers built in scripts/
348 PHONY += scripts_basic
350 $(Q)$(MAKE) $(build)=scripts/basic
352 # To avoid any implicit rule to kick in, define an empty command.
353 scripts/basic/%: scripts_basic ;
355 PHONY += outputmakefile
356 # outputmakefile generates a Makefile in the output directory, if using a
357 # separate output directory. This allows convenient use of make in the
360 ifneq ($(KBUILD_SRC),)
361 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
362 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
365 # To make sure we do not include .config for any of the *config targets
366 # catch them early, and hand them over to scripts/kconfig/Makefile
367 # It is allowed to specify more targets when calling make, including
368 # mixing *config targets and build targets.
369 # For example 'make oldconfig all'.
370 # Detect when mixed targets is specified, and make a second invocation
371 # of make so .config is not included in this case either (for *config).
373 no-dot-config-targets := clean mrproper distclean \
374 cscope TAGS tags help %docs check% \
375 include/linux/version.h headers_% \
376 kernelrelease kernelversion
382 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
383 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
388 ifeq ($(KBUILD_EXTMOD),)
389 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
391 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
397 ifeq ($(mixed-targets),1)
398 # ===========================================================================
399 # We're called with mixed targets (*config and build targets).
400 # Handle them one by one.
403 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
406 ifeq ($(config-targets),1)
407 # ===========================================================================
408 # *config targets only - make sure prerequisites are updated, and descend
409 # in scripts/kconfig to make the *config target
411 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
412 # KBUILD_DEFCONFIG may point out an alternative default configuration
413 # used for 'make defconfig'
414 include $(srctree)/arch/$(ARCH)/Makefile
415 export KBUILD_DEFCONFIG
417 config %config: scripts_basic outputmakefile FORCE
418 $(Q)mkdir -p include/linux include/config
419 $(Q)$(MAKE) $(build)=scripts/kconfig $@
422 # ===========================================================================
423 # Build targets only - this includes vmlinux, arch specific targets, clean
424 # targets and others. In general all targets except *config targets.
426 ifeq ($(KBUILD_EXTMOD),)
427 # Additional helpers built in scripts/
428 # Carefully list dependencies so we do not try to build scripts twice
431 scripts: scripts_basic include/config/auto.conf
432 $(Q)$(MAKE) $(build)=$(@)
434 # Objects we will link into vmlinux / subdirs we need to visit
436 drivers-y := drivers/ sound/
440 endif # KBUILD_EXTMOD
442 ifeq ($(dot-config),1)
444 -include include/config/auto.conf
446 ifeq ($(KBUILD_EXTMOD),)
447 # Read in dependencies to all Kconfig* files, make sure to run
448 # oldconfig if changes are detected.
449 -include include/config/auto.conf.cmd
451 # To avoid any implicit rule to kick in, define an empty command
452 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
454 # If .config is newer than include/config/auto.conf, someone tinkered
455 # with it and forgot to run make oldconfig.
456 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
457 # we execute the config step to be sure to catch updated Kconfig files
458 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
459 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
461 # external modules needs include/linux/autoconf.h and include/config/auto.conf
462 # but do not care if they are up-to-date. Use auto.conf to trigger the test
463 PHONY += include/config/auto.conf
465 include/config/auto.conf:
466 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
468 echo " ERROR: Kernel configuration is invalid."; \
469 echo " include/linux/autoconf.h or $@ are missing."; \
470 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
474 endif # KBUILD_EXTMOD
477 # Dummy target needed, because used as prerequisite
478 include/config/auto.conf: ;
479 endif # $(dot-config)
481 # The all: target is the default when no target is given on the
483 # This allow a user to issue only 'make' to build a kernel including modules
484 # Defaults vmlinux but it is usually overridden in the arch makefile
487 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
493 include $(srctree)/arch/$(ARCH)/Makefile
495 ifdef CONFIG_FRAME_POINTER
496 CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
498 CFLAGS += -fomit-frame-pointer
501 ifdef CONFIG_DEBUG_INFO
505 # Force gcc to behave correct even for buggy distributions
506 CFLAGS += $(call cc-option, -fno-stack-protector)
508 # arch Makefile may override CC so keep this after arch Makefile is included
509 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
510 CHECKFLAGS += $(NOSTDINC_FLAGS)
512 # warn about C99 declaration after statement
513 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
515 # disable pointer signed / unsigned warnings in gcc 4.0
516 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
518 # Use --build-id when available.
519 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
520 $(call ld-option, -Wl$(comma)--build-id,))
521 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
522 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
524 # Default kernel image to build when no specific target is given.
525 # KBUILD_IMAGE may be overruled on the command line or
526 # set in the environment
527 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
529 export KBUILD_IMAGE ?= vmlinux
532 # INSTALL_PATH specifies where to place the updated kernel and system map
533 # images. Default is /boot, but you can set it to other values
534 export INSTALL_PATH ?= /boot
537 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
538 # relocations required by build roots. This is not defined in the
539 # makefile but the argument can be passed to make if needed.
542 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
546 # INSTALL_MOD_STRIP, if defined, will cause modules to be
547 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
548 # the default option --strip-debug will be used. Otherwise,
549 # INSTALL_MOD_STRIP will used as the options to the strip command.
551 ifdef INSTALL_MOD_STRIP
552 ifeq ($(INSTALL_MOD_STRIP),1)
553 mod_strip_cmd = $(STRIP) --strip-debug
555 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
556 endif # INSTALL_MOD_STRIP=1
559 endif # INSTALL_MOD_STRIP
563 ifeq ($(KBUILD_EXTMOD),)
564 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
566 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
567 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
568 $(net-y) $(net-m) $(libs-y) $(libs-m)))
570 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
572 $(core-n) $(core-) $(drivers-n) $(drivers-) \
573 $(net-n) $(net-) $(libs-n) $(libs-))))
575 init-y := $(patsubst %/, %/built-in.o, $(init-y))
576 core-y := $(patsubst %/, %/built-in.o, $(core-y))
577 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
578 net-y := $(patsubst %/, %/built-in.o, $(net-y))
579 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
580 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
581 libs-y := $(libs-y1) $(libs-y2)
584 # ---------------------------------------------------------------------------
585 # vmlinux is built from the objects selected by $(vmlinux-init) and
586 # $(vmlinux-main). Most are built-in.o files from top-level directories
587 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
588 # Ordering when linking is important, and $(vmlinux-init) must be first.
593 # +-< $(vmlinux-init)
594 # | +--< init/version.o + more
596 # +--< $(vmlinux-main)
597 # | +--< driver/built-in.o mm/built-in.o + more
599 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
601 # vmlinux version (uname -v) cannot be updated during normal
602 # descending-into-subdirs phase since we do not yet know if we need to
604 # Therefore this step is delayed until just before final link of vmlinux -
605 # except in the kallsyms case where it is done just before adding the
606 # symbols to the kernel.
608 # System.map is generated to document addresses of all kernel symbols
610 vmlinux-init := $(head-y) $(init-y)
611 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
612 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
613 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
614 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
616 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
617 # May be overridden by arch/$(ARCH)/Makefile
618 quiet_cmd_vmlinux__ ?= LD $@
619 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
620 -T $(vmlinux-lds) $(vmlinux-init) \
621 --start-group $(vmlinux-main) --end-group \
622 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
624 # Generate new vmlinux version
625 quiet_cmd_vmlinux_version = GEN .version
626 cmd_vmlinux_version = set -e; \
627 if [ ! -r .version ]; then \
631 mv .version .old_version; \
632 expr 0$$(cat .old_version) + 1 >.version; \
634 $(MAKE) $(build)=init
636 # Generate System.map
637 quiet_cmd_sysmap = SYSMAP
638 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
641 # If CONFIG_KALLSYMS is set .version is already updated
642 # Generate System.map and verify that the content is consistent
643 # Use + in front of the vmlinux_version rule to silent warning with make -j2
644 # First command is ':' to allow us to use + in front of the rule
645 define rule_vmlinux__
647 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
649 $(call cmd,vmlinux__)
650 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
652 $(Q)$(if $($(quiet)cmd_sysmap), \
653 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
654 $(cmd_sysmap) $@ System.map; \
655 if [ $$? -ne 0 ]; then \
663 ifdef CONFIG_KALLSYMS
664 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
665 # It's a three stage process:
666 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
668 # Running kallsyms on that gives us .tmp_kallsyms1.o with
669 # the right size - vmlinux version (uname -v) is updated during this step
670 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
671 # but due to the added section, some addresses have shifted.
672 # From here, we generate a correct .tmp_kallsyms2.o
673 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
674 # o Verify that the System.map from vmlinux matches the map from
675 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
676 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
677 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
678 # temporary bypass to allow the kernel to be built while the
679 # maintainers work out what went wrong with kallsyms.
681 ifdef CONFIG_KALLSYMS_EXTRA_PASS
687 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
689 define verify_kallsyms
690 $(Q)$(if $($(quiet)cmd_sysmap), \
691 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
692 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
693 $(Q)cmp -s System.map .tmp_System.map || \
694 (echo Inconsistent kallsyms data; \
695 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
696 rm .tmp_kallsyms* ; /bin/false )
699 # Update vmlinux version before link
700 # Use + in front of this rule to silent warning about make -j1
701 # First command is ':' to allow us to use + in front of this rule
702 cmd_ksym_ld = $(cmd_vmlinux__)
705 +$(call cmd,vmlinux_version)
706 $(call cmd,vmlinux__)
707 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
710 # Generate .S file with all kernel symbols
711 quiet_cmd_kallsyms = KSYM $@
712 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
713 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
715 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
716 $(call if_changed_dep,as_o_S)
718 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
721 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
722 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
723 $(call if_changed_rule,ksym_ld)
725 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
726 $(call if_changed,vmlinux__)
728 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
729 $(call if_changed,vmlinux__)
731 # Needs to visit scripts/ before $(KALLSYMS) can be used.
732 $(KALLSYMS): scripts ;
734 # Generate some data for debugging strange kallsyms problems
735 debug_kallsyms: .tmp_map$(last_kallsyms)
737 .tmp_map%: .tmp_vmlinux% FORCE
738 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
744 endif # ifdef CONFIG_KALLSYMS
746 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
747 # relevant sections renamed as per the linker script.
748 quiet_cmd_vmlinux-modpost = LD $@
749 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
750 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
751 $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
752 define rule_vmlinux-modpost
754 +$(call cmd,vmlinux-modpost)
755 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
756 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
759 # vmlinux image - including updated kernel symbols
760 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE
761 ifdef CONFIG_HEADERS_CHECK
762 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
764 $(call vmlinux-modpost)
765 $(call if_changed_rule,vmlinux__)
766 $(Q)rm -f .old_version
768 vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
769 $(call if_changed_rule,vmlinux-modpost)
771 # The actual objects are generated when descending,
772 # make sure no implicit rule kicks in
773 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
775 # Handle descending into subdirectories listed in $(vmlinux-dirs)
776 # Preset locale variables to speed up the build process. Limit locale
777 # tweaks to this spot to avoid wrong language settings when running
778 # make menuconfig etc.
779 # Error messages still appears in the original language
781 PHONY += $(vmlinux-dirs)
782 $(vmlinux-dirs): prepare scripts
783 $(Q)$(MAKE) $(build)=$@
785 # Build the kernel release string
787 # The KERNELRELEASE value built here is stored in the file
788 # include/config/kernel.release, and is used when executing several
789 # make targets, such as "make install" or "make modules_install."
791 # The eventual kernel release string consists of the following fields,
792 # shown in a hierarchical format to show how smaller parts are concatenated
793 # to form the larger and final value, with values coming from places like
794 # the Makefile, kernel config options, make command line options and/or
795 # SCM tag information.
799 # $(PATCHLEVEL) eg, 6
801 # $(EXTRAVERSION) eg, -rc6
804 # localversion* (files without backups, containing '~')
805 # $(CONFIG_LOCALVERSION) (from kernel config setting)
806 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
807 # ./scripts/setlocalversion (SCM tag, if one exists)
808 # $(LOCALVERSION) (from make command line if provided)
810 # Note how the final $(localver-auto) string is included *only* if the
811 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
812 # moment, only git is supported but other SCMs can edit the script
813 # scripts/setlocalversion and add the appropriate checks as needed.
815 pattern = ".*/localversion[^~]*"
816 string = $(shell cat /dev/null \
817 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
819 localver = $(subst $(space),, $(string) \
820 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
822 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
823 # and if the SCM is know a tag from the SCM is appended.
824 # The appended tag is determined by the SCM used.
826 # Currently, only git is supported.
827 # Other SCMs can edit scripts/setlocalversion and add the appropriate
829 ifdef CONFIG_LOCALVERSION_AUTO
830 _localver-auto = $(shell $(CONFIG_SHELL) \
831 $(srctree)/scripts/setlocalversion $(srctree))
832 localver-auto = $(LOCALVERSION)$(_localver-auto)
835 localver-full = $(localver)$(localver-auto)
837 # Store (new) KERNELRELASE string in include/config/kernel.release
838 kernelrelease = $(KERNELVERSION)$(localver-full)
839 include/config/kernel.release: include/config/auto.conf FORCE
841 $(Q)echo $(kernelrelease) > $@
844 # Things we need to do before we recursively start building the kernel
845 # or the modules are listed in "prepare".
846 # A multi level approach is used. prepareN is processed before prepareN-1.
847 # archprepare is used in arch Makefiles and when processed asm symlink,
848 # version.h and scripts_basic is processed / created.
850 # Listed in dependency order
851 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
853 # prepare3 is used to check if we are building in a separate output directory,
855 # 1) Check that make has not been executed in the kernel src $(srctree)
856 # 2) Create the include2 directory, used for the second asm symlink
857 prepare3: include/config/kernel.release
858 ifneq ($(KBUILD_SRC),)
859 @echo ' Using $(srctree) as source for kernel'
860 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
861 echo " $(srctree) is not clean, please run 'make mrproper'";\
862 echo " in the '$(srctree)' directory.";\
865 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
866 $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
869 # prepare2 creates a makefile if using a separate output directory
870 prepare2: prepare3 outputmakefile
872 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
873 include/asm include/config/auto.conf
874 ifneq ($(KBUILD_MODULES),)
875 $(Q)mkdir -p $(MODVERDIR)
876 $(Q)rm -f $(MODVERDIR)/*
879 archprepare: prepare1 scripts_basic
881 prepare0: archprepare FORCE
882 $(Q)$(MAKE) $(build)=.
883 $(Q)$(MAKE) $(build)=. missing-syscalls
885 # All the preparing..
888 # Leave this as default for preprocessing vmlinux.lds.S, which is now
889 # done in arch/$(ARCH)/kernel/Makefile
891 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
893 # FIXME: The asm symlink changes when $(ARCH) changes. That's
894 # hard to detect, but I suppose "make mrproper" is a good idea
895 # before switching between archs anyway.
898 @echo ' SYMLINK $@ -> include/asm-$(SRCARCH)'
899 $(Q)if [ ! -d include ]; then mkdir -p include; fi;
900 @ln -fsn asm-$(SRCARCH) $@
902 # Generate some files
903 # ---------------------------------------------------------------------------
905 # KERNELRELEASE can change from a few different places, meaning version.h
906 # needs to be updated, so this check is forced on all builds
909 define filechk_utsrelease.h
910 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
911 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
914 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
917 define filechk_version.h
918 (echo \#define LINUX_VERSION_CODE $(shell \
919 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
920 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
923 include/linux/version.h: $(srctree)/Makefile FORCE
924 $(call filechk,version.h)
926 include/linux/utsrelease.h: include/config/kernel.release FORCE
927 $(call filechk,utsrelease.h)
929 # ---------------------------------------------------------------------------
933 @echo '*** Warning: make $@ is unnecessary now.'
935 # ---------------------------------------------------------------------------
937 INSTALL_HDR_PATH=$(objtree)/usr
938 export INSTALL_HDR_PATH
940 HDRFILTER=generic i386 x86_64
941 HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
943 PHONY += headers_install_all
944 headers_install_all: include/linux/version.h scripts_basic FORCE
945 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
946 $(Q)for arch in $(HDRARCHES); do \
947 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
950 PHONY += headers_install
951 headers_install: include/linux/version.h scripts_basic FORCE
952 @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
953 echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
955 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
956 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
958 PHONY += headers_check_all
959 headers_check_all: headers_install_all
960 $(Q)for arch in $(HDRARCHES); do \
961 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
964 PHONY += headers_check
965 headers_check: headers_install
966 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
968 # ---------------------------------------------------------------------------
973 # By default, build modules as well
980 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
981 @echo ' Building modules, stage 2.';
982 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
985 # Target to prepare building external modules
986 PHONY += modules_prepare
987 modules_prepare: prepare scripts
989 # Target to install modules
990 PHONY += modules_install
991 modules_install: _modinst_ _modinst_post
995 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
996 echo "Warning: you may need to install module-init-tools"; \
997 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1000 @rm -rf $(MODLIB)/kernel
1001 @rm -f $(MODLIB)/source
1002 @mkdir -p $(MODLIB)/kernel
1003 @ln -s $(srctree) $(MODLIB)/source
1004 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1005 rm -f $(MODLIB)/build ; \
1006 ln -s $(objtree) $(MODLIB)/build ; \
1008 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1010 # If System.map exists, run depmod. This deliberately does not have a
1011 # dependency on System.map since that would run the dependency tree on
1012 # vmlinux. This depmod is only for convenience to give the initial
1013 # boot a modules.dep even before / is mounted read-write. However the
1014 # boot script depmod is the master version.
1015 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
1018 depmod_opts := -b $(INSTALL_MOD_PATH) -r
1020 PHONY += _modinst_post
1021 _modinst_post: _modinst_
1022 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
1024 else # CONFIG_MODULES
1026 # Modules not configured
1027 # ---------------------------------------------------------------------------
1029 modules modules_install: FORCE
1031 @echo "The present kernel configuration has modules disabled."
1032 @echo "Type 'make config' and enable loadable module support."
1033 @echo "Then build a kernel with module support enabled."
1037 endif # CONFIG_MODULES
1040 # Cleaning is done on three levels.
1041 # make clean Delete most generated files
1042 # Leave enough to build external modules
1043 # make mrproper Delete the current configuration, and all generated files
1044 # make distclean Remove editor backup files, patch leftover files and the like
1046 # Directories & files removed with 'make clean'
1047 CLEAN_DIRS += $(MODVERDIR)
1048 CLEAN_FILES += vmlinux System.map \
1049 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1051 # Directories & files removed with 'make mrproper'
1052 MRPROPER_DIRS += include/config include2 usr/include
1053 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1054 include/linux/autoconf.h include/linux/version.h \
1055 include/linux/utsrelease.h \
1056 Module.symvers tags TAGS cscope*
1058 # clean - Delete most, but leave enough to build external modules
1060 clean: rm-dirs := $(CLEAN_DIRS)
1061 clean: rm-files := $(CLEAN_FILES)
1062 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1064 PHONY += $(clean-dirs) clean archclean
1066 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1068 clean: archclean $(clean-dirs)
1071 @find . $(RCS_FIND_IGNORE) \
1072 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1073 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1074 -o -name '*.symtypes' \) \
1075 -type f -print | xargs rm -f
1077 # mrproper - Delete all generated files, including .config
1079 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1080 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1081 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1083 PHONY += $(mrproper-dirs) mrproper archmrproper
1085 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1087 mrproper: clean archmrproper $(mrproper-dirs)
1096 @find $(srctree) $(RCS_FIND_IGNORE) \
1097 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1098 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1099 -o -name '.*.rej' -o -size 0 \
1100 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1101 -type f -print | xargs rm -f
1104 # Packaging of the kernel to various formats
1105 # ---------------------------------------------------------------------------
1106 # rpm target kept for backward compatibility
1107 package-dir := $(srctree)/scripts/package
1109 %pkg: include/config/kernel.release FORCE
1110 $(Q)$(MAKE) $(build)=$(package-dir) $@
1111 rpm: include/config/kernel.release FORCE
1112 $(Q)$(MAKE) $(build)=$(package-dir) $@
1115 # Brief documentation of the typical targets used
1116 # ---------------------------------------------------------------------------
1118 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1119 boards := $(notdir $(boards))
1122 @echo 'Cleaning targets:'
1123 @echo ' clean - Remove most generated files but keep the config and'
1124 @echo ' enough build support to build external modules'
1125 @echo ' mrproper - Remove all generated files + config + various backup files'
1126 @echo ' distclean - mrproper + remove editor backup and patch files'
1128 @echo 'Configuration targets:'
1129 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1131 @echo 'Other generic targets:'
1132 @echo ' all - Build all targets marked with [*]'
1133 @echo '* vmlinux - Build the bare kernel'
1134 @echo '* modules - Build all modules'
1135 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1136 @echo ' dir/ - Build all files in dir and below'
1137 @echo ' dir/file.[ois] - Build specified target only'
1138 @echo ' dir/file.ko - Build module including final link'
1139 @echo ' rpm - Build a kernel as an RPM package'
1140 @echo ' tags/TAGS - Generate tags file for editors'
1141 @echo ' cscope - Generate cscope index'
1142 @echo ' kernelrelease - Output the release version string'
1143 @echo ' kernelversion - Output the version stored in Makefile'
1144 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1145 echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1146 echo ' (default: $(INSTALL_HDR_PATH))'; \
1149 @echo 'Static analysers'
1150 @echo ' checkstack - Generate a list of stack hogs'
1151 @echo ' namespacecheck - Name space analysis on compiled kernel'
1152 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1153 echo ' headers_check - Sanity check on exported headers'; \
1156 @echo 'Kernel packaging:'
1157 @$(MAKE) $(build)=$(package-dir) help
1159 @echo 'Documentation targets:'
1160 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1162 @echo 'Architecture specific targets ($(ARCH)):'
1163 @$(if $(archhelp),$(archhelp),\
1164 echo ' No architecture specific help defined for $(ARCH)')
1167 $(foreach b, $(boards), \
1168 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1171 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1172 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1173 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1174 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1175 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1177 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1178 @echo 'For further info see the ./README file'
1181 # Documentation targets
1182 # ---------------------------------------------------------------------------
1183 %docs: scripts_basic FORCE
1184 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1186 else # KBUILD_EXTMOD
1189 # External module support.
1190 # When building external modules the kernel used as basis is considered
1191 # read-only, and no consistency checks are made and the make
1192 # system is not used on the basis kernel. If updates are required
1193 # in the basis kernel ordinary make commands (without M=...) must
1196 # The following are the only valid targets when building external
1198 # make M=dir clean Delete all automatically generated files
1199 # make M=dir modules Make all modules in specified dir
1200 # make M=dir Same as 'make M=dir modules'
1201 # make M=dir modules_install
1202 # Install the modules built in the module directory
1203 # Assumes install directory is already created
1205 # We are always building modules
1207 PHONY += crmodverdir
1209 $(Q)mkdir -p $(MODVERDIR)
1210 $(Q)rm -f $(MODVERDIR)/*
1212 PHONY += $(objtree)/Module.symvers
1213 $(objtree)/Module.symvers:
1214 @test -e $(objtree)/Module.symvers || ( \
1216 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1217 echo " is missing; modules will have no dependencies and modversions."; \
1220 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1221 PHONY += $(module-dirs) modules
1222 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1223 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1225 modules: $(module-dirs)
1226 @echo ' Building modules, stage 2.';
1227 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1229 PHONY += modules_install
1230 modules_install: _emodinst_ _emodinst_post
1232 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1235 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1236 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1238 # Run depmod only is we have System.map and depmod is executable
1239 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1240 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1241 $(DEPMOD) -ae -F System.map \
1242 $(if $(strip $(INSTALL_MOD_PATH)), \
1243 -b $(INSTALL_MOD_PATH) -r) \
1247 PHONY += _emodinst_post
1248 _emodinst_post: _emodinst_
1251 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1253 PHONY += $(clean-dirs) clean
1255 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1257 clean: rm-dirs := $(MODVERDIR)
1258 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1259 clean: $(clean-dirs)
1262 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1263 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1264 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1265 -type f -print | xargs rm -f
1268 @echo ' Building external modules.'
1269 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1271 @echo ' modules - default target, build the module(s)'
1272 @echo ' modules_install - install the module'
1273 @echo ' clean - remove generated files in module directory only'
1277 PHONY += prepare scripts
1280 endif # KBUILD_EXTMOD
1282 # Generate tags for editors
1283 # ---------------------------------------------------------------------------
1285 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1286 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1287 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1289 ifeq ($(src),$(obj))
1292 __srctree = $(srctree)/
1295 ifeq ($(ALLSOURCE_ARCHS),)
1297 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1299 ALLINCLUDE_ARCHS := $(SRCARCH)
1302 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
1303 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1306 # Take care of arch/x86
1307 ifeq ($(ARCH), $(SRCARCH))
1308 ALLSOURCE_ARCHS := $(ARCH)
1310 ALLSOURCE_ARCHS := $(ARCH) $(SRCARCH)
1314 ( for ARCH in $(ALLSOURCE_ARCHS) ; do \
1315 find $(__srctree)arch/$${SRCARCH} $(RCS_FIND_IGNORE) \
1318 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1320 find $(__srctree)include $(RCS_FIND_IGNORE) \
1321 \( -name config -o -name 'asm-*' \) -prune \
1322 -o -name $1 -print; \
1323 for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1324 find $(__srctree)include/asm-$${SRCARCH} $(RCS_FIND_IGNORE) \
1327 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1329 find $(__srctree) $(RCS_FIND_IGNORE) \
1330 \( -name include -o -name arch \) -prune -o \
1336 $(call find-sources,'*.[chS]')
1339 $(call find-sources,'Kconfig*')
1341 define all-defconfigs
1342 $(call find-sources,'defconfig')
1346 if $1 --version 2>&1 | grep -iq exuberant; then \
1347 $(all-sources) | xargs $1 -a \
1348 -I __initdata,__exitdata,__acquires,__releases \
1349 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1350 --extra=+f --c-kinds=+px \
1351 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1352 $(all-kconfigs) | xargs $1 -a \
1354 --language-force=kconfig \
1355 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
1356 $(all-defconfigs) | xargs -r $1 -a \
1357 --langdef=dotconfig \
1358 --language-force=dotconfig \
1359 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1360 elif $1 --version 2>&1 | grep -iq emacs; then \
1361 $(all-sources) | xargs $1 -a; \
1362 $(all-kconfigs) | xargs $1 -a \
1363 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
1364 $(all-defconfigs) | xargs -r $1 -a \
1365 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1367 $(all-sources) | xargs $1 -a; \
1371 quiet_cmd_cscope-file = FILELST cscope.files
1372 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1374 quiet_cmd_cscope = MAKE cscope.out
1375 cmd_cscope = cscope -b
1378 $(call cmd,cscope-file)
1381 quiet_cmd_TAGS = MAKE $@
1390 quiet_cmd_tags = MAKE $@
1400 # Scripts to check various things for consistency
1401 # ---------------------------------------------------------------------------
1404 find * $(RCS_FIND_IGNORE) \
1405 -name '*.[hcS]' -type f -print | sort \
1406 | xargs $(PERL) -w scripts/checkincludes.pl
1409 find * $(RCS_FIND_IGNORE) \
1410 -name '*.[hcS]' -type f -print | sort \
1411 | xargs $(PERL) -w scripts/checkversion.pl
1414 $(PERL) $(srctree)/scripts/namespace.pl
1416 endif #ifeq ($(config-targets),1)
1417 endif #ifeq ($(mixed-targets),1)
1419 PHONY += checkstack kernelrelease kernelversion
1421 # UML needs a little special treatment here. It wants to use the host
1422 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1423 # else wants $(ARCH), including people doing cross-builds, which means
1424 # that $(SUBARCH) doesn't work here.
1426 CHECKSTACK_ARCH := $(SUBARCH)
1428 CHECKSTACK_ARCH := $(ARCH)
1431 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1432 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1435 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1436 $(error kernelrelease not valid - run 'make prepare' to update it))
1438 @echo $(KERNELVERSION)
1441 # ---------------------------------------------------------------------------
1442 # Single targets are compatible with:
1443 # - build whith mixed source and output
1444 # - build with separate output dir 'make O=...'
1445 # - external modules
1447 # target-dir => where to store outputfile
1448 # build-dir => directory in kernel source tree to use
1450 ifeq ($(KBUILD_EXTMOD),)
1451 build-dir = $(patsubst %/,%,$(dir $@))
1452 target-dir = $(dir $@)
1454 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1455 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1456 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1459 %.s: %.c prepare scripts FORCE
1460 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1461 %.i: %.c prepare scripts FORCE
1462 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1463 %.o: %.c prepare scripts FORCE
1464 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1465 %.lst: %.c prepare scripts FORCE
1466 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1467 %.s: %.S prepare scripts FORCE
1468 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1469 %.o: %.S prepare scripts FORCE
1470 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1471 %.symtypes: %.c prepare scripts FORCE
1472 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1475 / %/: prepare scripts FORCE
1476 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1477 $(build)=$(build-dir)
1478 %.ko: prepare scripts FORCE
1479 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1480 $(build)=$(build-dir) $(@:.ko=.o)
1481 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1483 # FIXME Should go into a make.lib or something
1484 # ===========================================================================
1486 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1487 cmd_rmdirs = rm -rf $(rm-dirs)
1489 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1490 cmd_rmfiles = rm -f $(rm-files)
1493 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1494 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1495 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1497 quiet_cmd_as_o_S = AS $@
1498 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1500 # read all saved command lines
1502 targets := $(wildcard $(sort $(targets)))
1503 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1505 ifneq ($(cmd_files),)
1506 $(cmd_files): ; # Do not try to update included dependency files
1507 include $(cmd_files)
1510 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1512 # $(Q)$(MAKE) $(clean)=dir
1513 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1515 endif # skip-makefile
1520 # Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes.
1523 # Declare the contents of the .PHONY variable as phony. We keep that
1524 # information in a variable se we can use it in if_changed and friends.