5 NAME = Arr Matey! A Hairy Bilge Rat!
8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
14 # o use make's built-in rules and variables
15 # (this increases performance and avoid hard-to-debug behavour);
16 # o print "Entering directory ...";
17 MAKEFLAGS += -rR --no-print-directory
19 # We are using a recursive build, so we need to do a little thinking
20 # to get the ordering right.
22 # Most importantly: sub-Makefiles should only ever modify files in
23 # their own directory. If in some directory we have a dependency on
24 # a file in another dir (which doesn't happen often, but it's often
25 # unavoidable when linking the built-in.o targets which finally
26 # turn into vmlinux), we will call a sub make in that other dir, and
27 # after that we are sure that everything which is in that other dir
30 # The only cases where we need to modify files which have global
31 # effects are thus separated out and done before the recursive
32 # descending is started. They are now explicitly listed as the
35 # To put more focus on warnings, be less verbose as default
36 # Use 'make V=1' to see the full commands
39 ifeq ("$(origin V)", "command line")
47 # Call a source code checker (by default, "sparse") as part of the
50 # Use 'make C=1' to enable checking of only re-compiled files.
51 # Use 'make C=2' to enable checking of *all* source files, regardless
52 # of whether they are re-compiled or not.
54 # See the file "Documentation/sparse.txt" for more details, including
55 # where to get the "sparse" utility.
58 ifeq ("$(origin C)", "command line")
59 KBUILD_CHECKSRC = $(C)
62 ifndef KBUILD_CHECKSRC
66 # Use make M=dir to specify directory of external module to build
67 # Old syntax make ... SUBDIRS=$PWD is still supported
68 # Setting the environment variable KBUILD_EXTMOD take precedence
70 KBUILD_EXTMOD ?= $(SUBDIRS)
73 ifeq ("$(origin M)", "command line")
79 # kbuild supports saving output files in a separate directory.
80 # To locate output files in a separate directory two syntaxes are supported.
81 # In both cases the working directory must be the root of the kernel src.
83 # Use "make O=dir/to/store/output/files/"
85 # 2) Set KBUILD_OUTPUT
86 # Set the environment variable KBUILD_OUTPUT to point to the directory
87 # where the output files shall be placed.
88 # export KBUILD_OUTPUT=dir/to/store/output/files/
91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
95 # KBUILD_SRC is set on invocation of make in OBJ directory
96 # KBUILD_SRC is not intended to be used by the regular user (for now)
99 # OK, Make called in directory where kernel src resides
100 # Do we want to locate output files in a separate directory?
102 ifeq ("$(origin O)", "command line")
103 KBUILD_OUTPUT := $(O)
107 # That's our default target when none is given on the command line
111 ifneq ($(KBUILD_OUTPUT),)
112 # Invoke a second make in the output directory, passing relevant variables
113 # check that the output directory actually exists
114 saved-output := $(KBUILD_OUTPUT)
115 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
116 $(if $(KBUILD_OUTPUT),, \
117 $(error output directory "$(saved-output)" does not exist))
118 # Check that OUTPUT directory is not the same as where we have kernel src
119 $(if $(filter-out $(KBUILD_OUTPUT),$(shell /bin/pwd)),, \
120 $(error Output directory (O=...) specifies kernel src dir))
122 PHONY += $(MAKECMDGOALS) sub-make
124 $(filter-out _all sub-make,$(MAKECMDGOALS)) _all: sub-make
128 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
129 KBUILD_SRC=$(CURDIR) \
130 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
131 $(filter-out _all sub-make,$(MAKECMDGOALS))
133 # Leave processing to above invocation of make
135 endif # ifneq ($(KBUILD_OUTPUT),)
136 endif # ifeq ($(KBUILD_SRC),)
138 # We process the rest of the Makefile if this is the final invocation of make
139 ifeq ($(skip-makefile),)
141 # If building an external module we do not care about the all: rule
142 # but instead _all depend on modules
144 ifeq ($(KBUILD_EXTMOD),)
150 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
152 # FIXME - TOPDIR is obsolete, use srctree/objtree
157 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
159 export srctree objtree VPATH TOPDIR
162 # SUBARCH tells the usermode build what the underlying arch is. That is set
163 # first, and if a usermode build is happening, the "ARCH=um" on the command
164 # line overrides the setting of ARCH below. If a native build is happening,
165 # then ARCH is assigned, getting whatever value it gets normally, and
166 # SUBARCH is subsequently ignored.
168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
169 -e s/arm.*/arm/ -e s/sa110/arm/ \
170 -e s/s390x/s390/ -e s/parisc64/parisc/ \
171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
173 # Cross compiling and selecting different set of gcc/bin-utils
174 # ---------------------------------------------------------------------------
176 # When performing cross compilation for other architectures ARCH shall be set
177 # to the target architecture. (See arch/* for the possibilities).
178 # ARCH can be set during invocation of make:
180 # Another way is to have ARCH set in the environment.
181 # The default ARCH is the host where make is executed.
183 # CROSS_COMPILE specify the prefix used for all executables used
184 # during compilation. Only gcc and related bin-utils executables
185 # are prefixed with $(CROSS_COMPILE).
186 # CROSS_COMPILE can be set on the command line
187 # make CROSS_COMPILE=ia64-linux-
188 # Alternatively CROSS_COMPILE can be set in the environment.
189 # Default value for CROSS_COMPILE is not to prefix executables
190 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
195 # Architecture as present in compile.h
196 UTS_MACHINE := $(ARCH)
199 KCONFIG_CONFIG ?= .config
201 # SHELL used by kbuild
202 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
203 else if [ -x /bin/bash ]; then echo /bin/bash; \
204 else echo sh; fi ; fi)
208 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
211 # Decide whether to build built-in, modular, or both.
212 # Normally, just do built-in.
217 # If we have only "make modules", don't compile built-in objects.
218 # When we're building modules with modversions, we need to consider
219 # the built-in objects during the descend as well, in order to
220 # make sure the checksums are up to date before we record them.
222 ifeq ($(MAKECMDGOALS),modules)
223 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
226 # If we have "make <whatever> modules", compile modules
227 # in addition to whatever we do anyway.
228 # Just "make" or "make all" shall build modules as well
230 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
234 ifeq ($(MAKECMDGOALS),)
238 export KBUILD_MODULES KBUILD_BUILTIN
239 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
242 # ---------------------------------------------------------------------------
244 # Normally, we echo the whole command before executing it. By making
245 # that echo $($(quiet)$(cmd)), we now have the possibility to set
246 # $(quiet) to choose other forms of output instead, e.g.
248 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
249 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
251 # If $(quiet) is empty, the whole command will be printed.
252 # If it is set to "quiet_", only the short version will be printed.
253 # If it is set to "silent_", nothing will be printed at all, since
254 # the variable $(silent_cmd_cc_o_c) doesn't exist.
256 # A simple variant is to prefix commands with $(Q) - that's useful
257 # for commands that shall be hidden in non-verbose mode.
261 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
262 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
264 ifeq ($(KBUILD_VERBOSE),1)
272 # If the user is running make -s (silent mode), suppress echoing of
275 ifneq ($(findstring s,$(MAKEFLAGS)),)
279 export quiet Q KBUILD_VERBOSE
282 # Look for make include files relative to root of kernel src
283 MAKEFLAGS += --include-dir=$(srctree)
285 # We need some generic definitions.
286 include $(srctree)/scripts/Kbuild.include
288 # Make variables (CC, etc...)
290 AS = $(CROSS_COMPILE)as
291 LD = $(CROSS_COMPILE)ld
292 CC = $(CROSS_COMPILE)gcc
294 AR = $(CROSS_COMPILE)ar
295 NM = $(CROSS_COMPILE)nm
296 STRIP = $(CROSS_COMPILE)strip
297 OBJCOPY = $(CROSS_COMPILE)objcopy
298 OBJDUMP = $(CROSS_COMPILE)objdump
300 GENKSYMS = scripts/genksyms/genksyms
301 DEPMOD = /sbin/depmod
302 KALLSYMS = scripts/kallsyms
306 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
308 CFLAGS_MODULE = $(MODFLAGS)
309 AFLAGS_MODULE = $(MODFLAGS)
315 # Use LINUXINCLUDE when you must reference the include/ directory.
316 # Needed to be compatible with the O= option
317 LINUXINCLUDE := -Iinclude \
318 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
319 -include include/linux/autoconf.h
321 CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
323 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
324 -fno-strict-aliasing -fno-common \
325 -Werror-implicit-function-declaration
326 KBUILD_AFLAGS := -D__ASSEMBLY__
328 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
329 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
330 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
332 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
333 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
334 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
335 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
337 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
338 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
339 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
341 # When compiling out-of-tree modules, put MODVERDIR in the module
342 # tree rather than in the kernel tree. The kernel tree might
344 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
346 # Files to ignore in find ... statements
348 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
349 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
351 # ===========================================================================
352 # Rules shared between *config targets and build targets
354 # Basic helpers built in scripts/
355 PHONY += scripts_basic
357 $(Q)$(MAKE) $(build)=scripts/basic
359 # To avoid any implicit rule to kick in, define an empty command.
360 scripts/basic/%: scripts_basic ;
362 PHONY += outputmakefile
363 # outputmakefile generates a Makefile in the output directory, if using a
364 # separate output directory. This allows convenient use of make in the
367 ifneq ($(KBUILD_SRC),)
368 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
369 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
372 # To make sure we do not include .config for any of the *config targets
373 # catch them early, and hand them over to scripts/kconfig/Makefile
374 # It is allowed to specify more targets when calling make, including
375 # mixing *config targets and build targets.
376 # For example 'make oldconfig all'.
377 # Detect when mixed targets is specified, and make a second invocation
378 # of make so .config is not included in this case either (for *config).
380 no-dot-config-targets := clean mrproper distclean \
381 cscope TAGS tags help %docs check% \
382 include/linux/version.h headers_% \
383 kernelrelease kernelversion
389 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
390 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
395 ifeq ($(KBUILD_EXTMOD),)
396 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
398 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
404 ifeq ($(mixed-targets),1)
405 # ===========================================================================
406 # We're called with mixed targets (*config and build targets).
407 # Handle them one by one.
410 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
413 ifeq ($(config-targets),1)
414 # ===========================================================================
415 # *config targets only - make sure prerequisites are updated, and descend
416 # in scripts/kconfig to make the *config target
418 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
419 # KBUILD_DEFCONFIG may point out an alternative default configuration
420 # used for 'make defconfig'
421 include $(srctree)/arch/$(ARCH)/Makefile
422 export KBUILD_DEFCONFIG
424 config %config: scripts_basic outputmakefile FORCE
425 $(Q)mkdir -p include/linux include/config
426 $(Q)$(MAKE) $(build)=scripts/kconfig $@
429 # ===========================================================================
430 # Build targets only - this includes vmlinux, arch specific targets, clean
431 # targets and others. In general all targets except *config targets.
433 ifeq ($(KBUILD_EXTMOD),)
434 # Additional helpers built in scripts/
435 # Carefully list dependencies so we do not try to build scripts twice
438 scripts: scripts_basic include/config/auto.conf
439 $(Q)$(MAKE) $(build)=$(@)
441 # Objects we will link into vmlinux / subdirs we need to visit
443 drivers-y := drivers/ sound/
447 endif # KBUILD_EXTMOD
449 ifeq ($(dot-config),1)
451 -include include/config/auto.conf
453 ifeq ($(KBUILD_EXTMOD),)
454 # Read in dependencies to all Kconfig* files, make sure to run
455 # oldconfig if changes are detected.
456 -include include/config/auto.conf.cmd
458 # To avoid any implicit rule to kick in, define an empty command
459 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
461 # If .config is newer than include/config/auto.conf, someone tinkered
462 # with it and forgot to run make oldconfig.
463 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
464 # we execute the config step to be sure to catch updated Kconfig files
465 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
466 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
468 # external modules needs include/linux/autoconf.h and include/config/auto.conf
469 # but do not care if they are up-to-date. Use auto.conf to trigger the test
470 PHONY += include/config/auto.conf
472 include/config/auto.conf:
473 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
475 echo " ERROR: Kernel configuration is invalid."; \
476 echo " include/linux/autoconf.h or $@ are missing."; \
477 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
481 endif # KBUILD_EXTMOD
484 # Dummy target needed, because used as prerequisite
485 include/config/auto.conf: ;
486 endif # $(dot-config)
488 # The all: target is the default when no target is given on the
490 # This allow a user to issue only 'make' to build a kernel including modules
491 # Defaults vmlinux but it is usually overridden in the arch makefile
494 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
500 include $(srctree)/arch/$(ARCH)/Makefile
502 ifdef CONFIG_FRAME_POINTER
503 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
505 KBUILD_CFLAGS += -fomit-frame-pointer
508 ifdef CONFIG_DEBUG_INFO
510 KBUILD_AFLAGS += -gdwarf-2
513 # Force gcc to behave correct even for buggy distributions
514 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
516 # arch Makefile may override CC so keep this after arch Makefile is included
517 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
518 CHECKFLAGS += $(NOSTDINC_FLAGS)
520 # warn about C99 declaration after statement
521 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
523 # disable pointer signed / unsigned warnings in gcc 4.0
524 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
526 # Use --build-id when available.
527 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
528 $(call ld-option, -Wl$(comma)--build-id,))
529 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
530 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
532 # Default kernel image to build when no specific target is given.
533 # KBUILD_IMAGE may be overruled on the command line or
534 # set in the environment
535 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
537 export KBUILD_IMAGE ?= vmlinux
540 # INSTALL_PATH specifies where to place the updated kernel and system map
541 # images. Default is /boot, but you can set it to other values
542 export INSTALL_PATH ?= /boot
545 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
546 # relocations required by build roots. This is not defined in the
547 # makefile but the argument can be passed to make if needed.
550 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
554 # INSTALL_MOD_STRIP, if defined, will cause modules to be
555 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
556 # the default option --strip-debug will be used. Otherwise,
557 # INSTALL_MOD_STRIP will used as the options to the strip command.
559 ifdef INSTALL_MOD_STRIP
560 ifeq ($(INSTALL_MOD_STRIP),1)
561 mod_strip_cmd = $(STRIP) --strip-debug
563 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
564 endif # INSTALL_MOD_STRIP=1
567 endif # INSTALL_MOD_STRIP
571 ifeq ($(KBUILD_EXTMOD),)
572 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
574 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
575 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
576 $(net-y) $(net-m) $(libs-y) $(libs-m)))
578 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
580 $(core-n) $(core-) $(drivers-n) $(drivers-) \
581 $(net-n) $(net-) $(libs-n) $(libs-))))
583 init-y := $(patsubst %/, %/built-in.o, $(init-y))
584 core-y := $(patsubst %/, %/built-in.o, $(core-y))
585 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
586 net-y := $(patsubst %/, %/built-in.o, $(net-y))
587 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
588 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
589 libs-y := $(libs-y1) $(libs-y2)
592 # ---------------------------------------------------------------------------
593 # vmlinux is built from the objects selected by $(vmlinux-init) and
594 # $(vmlinux-main). Most are built-in.o files from top-level directories
595 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
596 # Ordering when linking is important, and $(vmlinux-init) must be first.
601 # +-< $(vmlinux-init)
602 # | +--< init/version.o + more
604 # +--< $(vmlinux-main)
605 # | +--< driver/built-in.o mm/built-in.o + more
607 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
609 # vmlinux version (uname -v) cannot be updated during normal
610 # descending-into-subdirs phase since we do not yet know if we need to
612 # Therefore this step is delayed until just before final link of vmlinux -
613 # except in the kallsyms case where it is done just before adding the
614 # symbols to the kernel.
616 # System.map is generated to document addresses of all kernel symbols
618 vmlinux-init := $(head-y) $(init-y)
619 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
620 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
621 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
622 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
624 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
625 # May be overridden by arch/$(ARCH)/Makefile
626 quiet_cmd_vmlinux__ ?= LD $@
627 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
628 -T $(vmlinux-lds) $(vmlinux-init) \
629 --start-group $(vmlinux-main) --end-group \
630 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
632 # Generate new vmlinux version
633 quiet_cmd_vmlinux_version = GEN .version
634 cmd_vmlinux_version = set -e; \
635 if [ ! -r .version ]; then \
639 mv .version .old_version; \
640 expr 0$$(cat .old_version) + 1 >.version; \
642 $(MAKE) $(build)=init
644 # Generate System.map
645 quiet_cmd_sysmap = SYSMAP
646 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
649 # If CONFIG_KALLSYMS is set .version is already updated
650 # Generate System.map and verify that the content is consistent
651 # Use + in front of the vmlinux_version rule to silent warning with make -j2
652 # First command is ':' to allow us to use + in front of the rule
653 define rule_vmlinux__
655 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
657 $(call cmd,vmlinux__)
658 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
660 $(Q)$(if $($(quiet)cmd_sysmap), \
661 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
662 $(cmd_sysmap) $@ System.map; \
663 if [ $$? -ne 0 ]; then \
671 ifdef CONFIG_KALLSYMS
672 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
673 # It's a three stage process:
674 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
676 # Running kallsyms on that gives us .tmp_kallsyms1.o with
677 # the right size - vmlinux version (uname -v) is updated during this step
678 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
679 # but due to the added section, some addresses have shifted.
680 # From here, we generate a correct .tmp_kallsyms2.o
681 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
682 # o Verify that the System.map from vmlinux matches the map from
683 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
684 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
685 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
686 # temporary bypass to allow the kernel to be built while the
687 # maintainers work out what went wrong with kallsyms.
689 ifdef CONFIG_KALLSYMS_EXTRA_PASS
695 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
697 define verify_kallsyms
698 $(Q)$(if $($(quiet)cmd_sysmap), \
699 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
700 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
701 $(Q)cmp -s System.map .tmp_System.map || \
702 (echo Inconsistent kallsyms data; \
703 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
704 rm .tmp_kallsyms* ; /bin/false )
707 # Update vmlinux version before link
708 # Use + in front of this rule to silent warning about make -j1
709 # First command is ':' to allow us to use + in front of this rule
710 cmd_ksym_ld = $(cmd_vmlinux__)
713 +$(call cmd,vmlinux_version)
714 $(call cmd,vmlinux__)
715 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
718 # Generate .S file with all kernel symbols
719 quiet_cmd_kallsyms = KSYM $@
720 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
721 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
723 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
724 $(call if_changed_dep,as_o_S)
726 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
729 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
730 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
731 $(call if_changed_rule,ksym_ld)
733 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
734 $(call if_changed,vmlinux__)
736 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
737 $(call if_changed,vmlinux__)
739 # Needs to visit scripts/ before $(KALLSYMS) can be used.
740 $(KALLSYMS): scripts ;
742 # Generate some data for debugging strange kallsyms problems
743 debug_kallsyms: .tmp_map$(last_kallsyms)
745 .tmp_map%: .tmp_vmlinux% FORCE
746 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
752 endif # ifdef CONFIG_KALLSYMS
754 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
755 # relevant sections renamed as per the linker script.
756 quiet_cmd_vmlinux-modpost = LD $@
757 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
758 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
759 $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
760 define rule_vmlinux-modpost
762 +$(call cmd,vmlinux-modpost)
763 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
764 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
767 # vmlinux image - including updated kernel symbols
768 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE
769 ifdef CONFIG_HEADERS_CHECK
770 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
772 $(call vmlinux-modpost)
773 $(call if_changed_rule,vmlinux__)
774 $(Q)rm -f .old_version
776 vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
777 $(call if_changed_rule,vmlinux-modpost)
779 # The actual objects are generated when descending,
780 # make sure no implicit rule kicks in
781 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
783 # Handle descending into subdirectories listed in $(vmlinux-dirs)
784 # Preset locale variables to speed up the build process. Limit locale
785 # tweaks to this spot to avoid wrong language settings when running
786 # make menuconfig etc.
787 # Error messages still appears in the original language
789 PHONY += $(vmlinux-dirs)
790 $(vmlinux-dirs): prepare scripts
791 $(Q)$(MAKE) $(build)=$@
793 # Build the kernel release string
795 # The KERNELRELEASE value built here is stored in the file
796 # include/config/kernel.release, and is used when executing several
797 # make targets, such as "make install" or "make modules_install."
799 # The eventual kernel release string consists of the following fields,
800 # shown in a hierarchical format to show how smaller parts are concatenated
801 # to form the larger and final value, with values coming from places like
802 # the Makefile, kernel config options, make command line options and/or
803 # SCM tag information.
807 # $(PATCHLEVEL) eg, 6
809 # $(EXTRAVERSION) eg, -rc6
812 # localversion* (files without backups, containing '~')
813 # $(CONFIG_LOCALVERSION) (from kernel config setting)
814 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
815 # ./scripts/setlocalversion (SCM tag, if one exists)
816 # $(LOCALVERSION) (from make command line if provided)
818 # Note how the final $(localver-auto) string is included *only* if the
819 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
820 # moment, only git is supported but other SCMs can edit the script
821 # scripts/setlocalversion and add the appropriate checks as needed.
823 pattern = ".*/localversion[^~]*"
824 string = $(shell cat /dev/null \
825 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
827 localver = $(subst $(space),, $(string) \
828 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
830 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
831 # and if the SCM is know a tag from the SCM is appended.
832 # The appended tag is determined by the SCM used.
834 # Currently, only git is supported.
835 # Other SCMs can edit scripts/setlocalversion and add the appropriate
837 ifdef CONFIG_LOCALVERSION_AUTO
838 _localver-auto = $(shell $(CONFIG_SHELL) \
839 $(srctree)/scripts/setlocalversion $(srctree))
840 localver-auto = $(LOCALVERSION)$(_localver-auto)
843 localver-full = $(localver)$(localver-auto)
845 # Store (new) KERNELRELASE string in include/config/kernel.release
846 kernelrelease = $(KERNELVERSION)$(localver-full)
847 include/config/kernel.release: include/config/auto.conf FORCE
849 $(Q)echo $(kernelrelease) > $@
852 # Things we need to do before we recursively start building the kernel
853 # or the modules are listed in "prepare".
854 # A multi level approach is used. prepareN is processed before prepareN-1.
855 # archprepare is used in arch Makefiles and when processed asm symlink,
856 # version.h and scripts_basic is processed / created.
858 # Listed in dependency order
859 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
861 # prepare3 is used to check if we are building in a separate output directory,
863 # 1) Check that make has not been executed in the kernel src $(srctree)
864 # 2) Create the include2 directory, used for the second asm symlink
865 prepare3: include/config/kernel.release
866 ifneq ($(KBUILD_SRC),)
867 @echo ' Using $(srctree) as source for kernel'
868 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
869 echo " $(srctree) is not clean, please run 'make mrproper'";\
870 echo " in the '$(srctree)' directory.";\
873 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
874 $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
877 # prepare2 creates a makefile if using a separate output directory
878 prepare2: prepare3 outputmakefile
880 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
881 include/asm include/config/auto.conf
882 ifneq ($(KBUILD_MODULES),)
883 $(Q)mkdir -p $(MODVERDIR)
884 $(Q)rm -f $(MODVERDIR)/*
887 archprepare: prepare1 scripts_basic
889 prepare0: archprepare FORCE
890 $(Q)$(MAKE) $(build)=.
891 $(Q)$(MAKE) $(build)=. missing-syscalls
893 # All the preparing..
896 # Leave this as default for preprocessing vmlinux.lds.S, which is now
897 # done in arch/$(ARCH)/kernel/Makefile
899 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
901 # FIXME: The asm symlink changes when $(ARCH) changes. That's
902 # hard to detect, but I suppose "make mrproper" is a good idea
903 # before switching between archs anyway.
906 @echo ' SYMLINK $@ -> include/asm-$(SRCARCH)'
907 $(Q)if [ ! -d include ]; then mkdir -p include; fi;
908 @ln -fsn asm-$(SRCARCH) $@
910 # Generate some files
911 # ---------------------------------------------------------------------------
913 # KERNELRELEASE can change from a few different places, meaning version.h
914 # needs to be updated, so this check is forced on all builds
917 define filechk_utsrelease.h
918 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
919 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
922 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
925 define filechk_version.h
926 (echo \#define LINUX_VERSION_CODE $(shell \
927 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
928 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
931 include/linux/version.h: $(srctree)/Makefile FORCE
932 $(call filechk,version.h)
934 include/linux/utsrelease.h: include/config/kernel.release FORCE
935 $(call filechk,utsrelease.h)
937 # ---------------------------------------------------------------------------
941 @echo '*** Warning: make $@ is unnecessary now.'
943 # ---------------------------------------------------------------------------
945 INSTALL_HDR_PATH=$(objtree)/usr
946 export INSTALL_HDR_PATH
948 HDRFILTER=generic i386 x86_64
949 HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
951 PHONY += headers_install_all
952 headers_install_all: include/linux/version.h scripts_basic FORCE
953 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
954 $(Q)for arch in $(HDRARCHES); do \
955 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
958 PHONY += headers_install
959 headers_install: include/linux/version.h scripts_basic FORCE
960 @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
961 echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
963 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
964 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
966 PHONY += headers_check_all
967 headers_check_all: headers_install_all
968 $(Q)for arch in $(HDRARCHES); do \
969 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
972 PHONY += headers_check
973 headers_check: headers_install
974 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
976 # ---------------------------------------------------------------------------
981 # By default, build modules as well
988 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
989 @echo ' Building modules, stage 2.';
990 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
993 # Target to prepare building external modules
994 PHONY += modules_prepare
995 modules_prepare: prepare scripts
997 # Target to install modules
998 PHONY += modules_install
999 modules_install: _modinst_ _modinst_post
1003 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1004 echo "Warning: you may need to install module-init-tools"; \
1005 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1008 @rm -rf $(MODLIB)/kernel
1009 @rm -f $(MODLIB)/source
1010 @mkdir -p $(MODLIB)/kernel
1011 @ln -s $(srctree) $(MODLIB)/source
1012 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1013 rm -f $(MODLIB)/build ; \
1014 ln -s $(objtree) $(MODLIB)/build ; \
1016 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1018 # If System.map exists, run depmod. This deliberately does not have a
1019 # dependency on System.map since that would run the dependency tree on
1020 # vmlinux. This depmod is only for convenience to give the initial
1021 # boot a modules.dep even before / is mounted read-write. However the
1022 # boot script depmod is the master version.
1023 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
1026 depmod_opts := -b $(INSTALL_MOD_PATH) -r
1028 PHONY += _modinst_post
1029 _modinst_post: _modinst_
1030 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
1032 else # CONFIG_MODULES
1034 # Modules not configured
1035 # ---------------------------------------------------------------------------
1037 modules modules_install: FORCE
1039 @echo "The present kernel configuration has modules disabled."
1040 @echo "Type 'make config' and enable loadable module support."
1041 @echo "Then build a kernel with module support enabled."
1045 endif # CONFIG_MODULES
1048 # Cleaning is done on three levels.
1049 # make clean Delete most generated files
1050 # Leave enough to build external modules
1051 # make mrproper Delete the current configuration, and all generated files
1052 # make distclean Remove editor backup files, patch leftover files and the like
1054 # Directories & files removed with 'make clean'
1055 CLEAN_DIRS += $(MODVERDIR)
1056 CLEAN_FILES += vmlinux System.map \
1057 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1059 # Directories & files removed with 'make mrproper'
1060 MRPROPER_DIRS += include/config include2 usr/include
1061 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1062 include/linux/autoconf.h include/linux/version.h \
1063 include/linux/utsrelease.h \
1064 Module.symvers tags TAGS cscope*
1066 # clean - Delete most, but leave enough to build external modules
1068 clean: rm-dirs := $(CLEAN_DIRS)
1069 clean: rm-files := $(CLEAN_FILES)
1070 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1072 PHONY += $(clean-dirs) clean archclean
1074 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1076 clean: archclean $(clean-dirs)
1079 @find . $(RCS_FIND_IGNORE) \
1080 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1081 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1082 -o -name '*.symtypes' \) \
1083 -type f -print | xargs rm -f
1085 # mrproper - Delete all generated files, including .config
1087 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1088 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1089 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1091 PHONY += $(mrproper-dirs) mrproper archmrproper
1093 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1095 mrproper: clean archmrproper $(mrproper-dirs)
1104 @find $(srctree) $(RCS_FIND_IGNORE) \
1105 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1106 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1107 -o -name '.*.rej' -o -size 0 \
1108 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1109 -type f -print | xargs rm -f
1112 # Packaging of the kernel to various formats
1113 # ---------------------------------------------------------------------------
1114 # rpm target kept for backward compatibility
1115 package-dir := $(srctree)/scripts/package
1117 %pkg: include/config/kernel.release FORCE
1118 $(Q)$(MAKE) $(build)=$(package-dir) $@
1119 rpm: include/config/kernel.release FORCE
1120 $(Q)$(MAKE) $(build)=$(package-dir) $@
1123 # Brief documentation of the typical targets used
1124 # ---------------------------------------------------------------------------
1126 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1127 boards := $(notdir $(boards))
1130 @echo 'Cleaning targets:'
1131 @echo ' clean - Remove most generated files but keep the config and'
1132 @echo ' enough build support to build external modules'
1133 @echo ' mrproper - Remove all generated files + config + various backup files'
1134 @echo ' distclean - mrproper + remove editor backup and patch files'
1136 @echo 'Configuration targets:'
1137 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1139 @echo 'Other generic targets:'
1140 @echo ' all - Build all targets marked with [*]'
1141 @echo '* vmlinux - Build the bare kernel'
1142 @echo '* modules - Build all modules'
1143 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1144 @echo ' dir/ - Build all files in dir and below'
1145 @echo ' dir/file.[ois] - Build specified target only'
1146 @echo ' dir/file.ko - Build module including final link'
1147 @echo ' rpm - Build a kernel as an RPM package'
1148 @echo ' tags/TAGS - Generate tags file for editors'
1149 @echo ' cscope - Generate cscope index'
1150 @echo ' kernelrelease - Output the release version string'
1151 @echo ' kernelversion - Output the version stored in Makefile'
1152 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1153 echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1154 echo ' (default: $(INSTALL_HDR_PATH))'; \
1157 @echo 'Static analysers'
1158 @echo ' checkstack - Generate a list of stack hogs'
1159 @echo ' namespacecheck - Name space analysis on compiled kernel'
1160 @echo ' export_report - List the usages of all exported symbols'
1161 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1162 echo ' headers_check - Sanity check on exported headers'; \
1165 @echo 'Kernel packaging:'
1166 @$(MAKE) $(build)=$(package-dir) help
1168 @echo 'Documentation targets:'
1169 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1171 @echo 'Architecture specific targets ($(ARCH)):'
1172 @$(if $(archhelp),$(archhelp),\
1173 echo ' No architecture specific help defined for $(ARCH)')
1176 $(foreach b, $(boards), \
1177 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1180 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1181 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1182 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1183 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1184 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1186 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1187 @echo 'For further info see the ./README file'
1190 # Documentation targets
1191 # ---------------------------------------------------------------------------
1192 %docs: scripts_basic FORCE
1193 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1195 else # KBUILD_EXTMOD
1198 # External module support.
1199 # When building external modules the kernel used as basis is considered
1200 # read-only, and no consistency checks are made and the make
1201 # system is not used on the basis kernel. If updates are required
1202 # in the basis kernel ordinary make commands (without M=...) must
1205 # The following are the only valid targets when building external
1207 # make M=dir clean Delete all automatically generated files
1208 # make M=dir modules Make all modules in specified dir
1209 # make M=dir Same as 'make M=dir modules'
1210 # make M=dir modules_install
1211 # Install the modules built in the module directory
1212 # Assumes install directory is already created
1214 # We are always building modules
1216 PHONY += crmodverdir
1218 $(Q)mkdir -p $(MODVERDIR)
1219 $(Q)rm -f $(MODVERDIR)/*
1221 PHONY += $(objtree)/Module.symvers
1222 $(objtree)/Module.symvers:
1223 @test -e $(objtree)/Module.symvers || ( \
1225 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1226 echo " is missing; modules will have no dependencies and modversions."; \
1229 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1230 PHONY += $(module-dirs) modules
1231 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1232 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1234 modules: $(module-dirs)
1235 @echo ' Building modules, stage 2.';
1236 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1238 PHONY += modules_install
1239 modules_install: _emodinst_ _emodinst_post
1241 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1244 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1245 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1247 # Run depmod only is we have System.map and depmod is executable
1248 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1249 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1250 $(DEPMOD) -ae -F System.map \
1251 $(if $(strip $(INSTALL_MOD_PATH)), \
1252 -b $(INSTALL_MOD_PATH) -r) \
1256 PHONY += _emodinst_post
1257 _emodinst_post: _emodinst_
1260 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1262 PHONY += $(clean-dirs) clean
1264 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1266 clean: rm-dirs := $(MODVERDIR)
1267 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1268 clean: $(clean-dirs)
1271 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1272 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1273 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1274 -type f -print | xargs rm -f
1277 @echo ' Building external modules.'
1278 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1280 @echo ' modules - default target, build the module(s)'
1281 @echo ' modules_install - install the module'
1282 @echo ' clean - remove generated files in module directory only'
1286 PHONY += prepare scripts
1289 endif # KBUILD_EXTMOD
1291 # Generate tags for editors
1292 # ---------------------------------------------------------------------------
1294 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1295 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1296 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1298 ifeq ($(src),$(obj))
1301 __srctree = $(srctree)/
1304 ifeq ($(ALLSOURCE_ARCHS),)
1306 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1308 ALLINCLUDE_ARCHS := $(SRCARCH)
1311 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
1312 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1315 # Take care of arch/x86
1316 ifeq ($(ARCH), $(SRCARCH))
1317 ALLSOURCE_ARCHS := $(ARCH)
1319 ALLSOURCE_ARCHS := $(ARCH) $(SRCARCH)
1323 ( for ARCH in $(ALLSOURCE_ARCHS) ; do \
1324 find $(__srctree)arch/$${SRCARCH} $(RCS_FIND_IGNORE) \
1327 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1329 find $(__srctree)include $(RCS_FIND_IGNORE) \
1330 \( -name config -o -name 'asm-*' \) -prune \
1331 -o -name $1 -print; \
1332 for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1333 find $(__srctree)include/asm-$${SRCARCH} $(RCS_FIND_IGNORE) \
1336 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1338 find $(__srctree) $(RCS_FIND_IGNORE) \
1339 \( -name include -o -name arch \) -prune -o \
1345 $(call find-sources,'*.[chS]')
1348 $(call find-sources,'Kconfig*')
1350 define all-defconfigs
1351 $(call find-sources,'defconfig')
1355 if $1 --version 2>&1 | grep -iq exuberant; then \
1356 $(all-sources) | xargs $1 -a \
1357 -I __initdata,__exitdata,__acquires,__releases \
1358 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1359 --extra=+f --c-kinds=+px \
1360 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1361 $(all-kconfigs) | xargs $1 -a \
1363 --language-force=kconfig \
1364 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
1365 $(all-defconfigs) | xargs -r $1 -a \
1366 --langdef=dotconfig \
1367 --language-force=dotconfig \
1368 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1369 elif $1 --version 2>&1 | grep -iq emacs; then \
1370 $(all-sources) | xargs $1 -a; \
1371 $(all-kconfigs) | xargs $1 -a \
1372 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
1373 $(all-defconfigs) | xargs -r $1 -a \
1374 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1376 $(all-sources) | xargs $1 -a; \
1380 quiet_cmd_cscope-file = FILELST cscope.files
1381 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1383 quiet_cmd_cscope = MAKE cscope.out
1384 cmd_cscope = cscope -b
1387 $(call cmd,cscope-file)
1390 quiet_cmd_TAGS = MAKE $@
1399 quiet_cmd_tags = MAKE $@
1409 # Scripts to check various things for consistency
1410 # ---------------------------------------------------------------------------
1413 find * $(RCS_FIND_IGNORE) \
1414 -name '*.[hcS]' -type f -print | sort \
1415 | xargs $(PERL) -w scripts/checkincludes.pl
1418 find * $(RCS_FIND_IGNORE) \
1419 -name '*.[hcS]' -type f -print | sort \
1420 | xargs $(PERL) -w scripts/checkversion.pl
1423 $(PERL) $(srctree)/scripts/namespace.pl
1426 $(PERL) $(srctree)/scripts/export_report.pl
1428 endif #ifeq ($(config-targets),1)
1429 endif #ifeq ($(mixed-targets),1)
1431 PHONY += checkstack kernelrelease kernelversion
1433 # UML needs a little special treatment here. It wants to use the host
1434 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1435 # else wants $(ARCH), including people doing cross-builds, which means
1436 # that $(SUBARCH) doesn't work here.
1438 CHECKSTACK_ARCH := $(SUBARCH)
1440 CHECKSTACK_ARCH := $(ARCH)
1443 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1444 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1447 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1448 $(error kernelrelease not valid - run 'make prepare' to update it))
1450 @echo $(KERNELVERSION)
1453 # ---------------------------------------------------------------------------
1454 # Single targets are compatible with:
1455 # - build whith mixed source and output
1456 # - build with separate output dir 'make O=...'
1457 # - external modules
1459 # target-dir => where to store outputfile
1460 # build-dir => directory in kernel source tree to use
1462 ifeq ($(KBUILD_EXTMOD),)
1463 build-dir = $(patsubst %/,%,$(dir $@))
1464 target-dir = $(dir $@)
1466 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1467 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1468 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1471 %.s: %.c prepare scripts FORCE
1472 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1473 %.i: %.c prepare scripts FORCE
1474 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1475 %.o: %.c prepare scripts FORCE
1476 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1477 %.lst: %.c prepare scripts FORCE
1478 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1479 %.s: %.S prepare scripts FORCE
1480 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1481 %.o: %.S prepare scripts FORCE
1482 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1483 %.symtypes: %.c prepare scripts FORCE
1484 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1487 / %/: prepare scripts FORCE
1488 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1489 $(build)=$(build-dir)
1490 %.ko: prepare scripts FORCE
1491 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1492 $(build)=$(build-dir) $(@:.ko=.o)
1493 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1495 # FIXME Should go into a make.lib or something
1496 # ===========================================================================
1498 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1499 cmd_rmdirs = rm -rf $(rm-dirs)
1501 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1502 cmd_rmfiles = rm -f $(rm-files)
1505 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1506 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1507 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1509 quiet_cmd_as_o_S = AS $@
1510 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1512 # read all saved command lines
1514 targets := $(wildcard $(sort $(targets)))
1515 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1517 ifneq ($(cmd_files),)
1518 $(cmd_files): ; # Do not try to update included dependency files
1519 include $(cmd_files)
1522 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1524 # $(Q)$(MAKE) $(clean)=dir
1525 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1527 endif # skip-makefile
1532 # Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes.
1535 # Declare the contents of the .PHONY variable as phony. We keep that
1536 # information in a variable se we can use it in if_changed and friends.