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))
121 PHONY += $(MAKECMDGOALS)
123 $(filter-out _all,$(MAKECMDGOALS)) _all:
124 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
125 KBUILD_SRC=$(CURDIR) \
126 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
128 # Leave processing to above invocation of make
130 endif # ifneq ($(KBUILD_OUTPUT),)
131 endif # ifeq ($(KBUILD_SRC),)
133 # We process the rest of the Makefile if this is the final invocation of make
134 ifeq ($(skip-makefile),)
136 # If building an external module we do not care about the all: rule
137 # but instead _all depend on modules
139 ifeq ($(KBUILD_EXTMOD),)
145 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
147 # FIXME - TOPDIR is obsolete, use srctree/objtree
152 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
154 export srctree objtree VPATH TOPDIR
157 # SUBARCH tells the usermode build what the underlying arch is. That is set
158 # first, and if a usermode build is happening, the "ARCH=um" on the command
159 # line overrides the setting of ARCH below. If a native build is happening,
160 # then ARCH is assigned, getting whatever value it gets normally, and
161 # SUBARCH is subsequently ignored.
163 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
164 -e s/arm.*/arm/ -e s/sa110/arm/ \
165 -e s/s390x/s390/ -e s/parisc64/parisc/ \
166 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
168 # Cross compiling and selecting different set of gcc/bin-utils
169 # ---------------------------------------------------------------------------
171 # When performing cross compilation for other architectures ARCH shall be set
172 # to the target architecture. (See arch/* for the possibilities).
173 # ARCH can be set during invocation of make:
175 # Another way is to have ARCH set in the environment.
176 # The default ARCH is the host where make is executed.
178 # CROSS_COMPILE specify the prefix used for all executables used
179 # during compilation. Only gcc and related bin-utils executables
180 # are prefixed with $(CROSS_COMPILE).
181 # CROSS_COMPILE can be set on the command line
182 # make CROSS_COMPILE=ia64-linux-
183 # Alternatively CROSS_COMPILE can be set in the environment.
184 # Default value for CROSS_COMPILE is not to prefix executables
185 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
190 # Architecture as present in compile.h
191 UTS_MACHINE := $(ARCH)
194 KCONFIG_CONFIG ?= .config
196 # SHELL used by kbuild
197 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
198 else if [ -x /bin/bash ]; then echo /bin/bash; \
199 else echo sh; fi ; fi)
203 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
206 # Decide whether to build built-in, modular, or both.
207 # Normally, just do built-in.
212 # If we have only "make modules", don't compile built-in objects.
213 # When we're building modules with modversions, we need to consider
214 # the built-in objects during the descend as well, in order to
215 # make sure the checksums are up to date before we record them.
217 ifeq ($(MAKECMDGOALS),modules)
218 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
221 # If we have "make <whatever> modules", compile modules
222 # in addition to whatever we do anyway.
223 # Just "make" or "make all" shall build modules as well
225 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
229 ifeq ($(MAKECMDGOALS),)
233 export KBUILD_MODULES KBUILD_BUILTIN
234 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
237 # ---------------------------------------------------------------------------
239 # Normally, we echo the whole command before executing it. By making
240 # that echo $($(quiet)$(cmd)), we now have the possibility to set
241 # $(quiet) to choose other forms of output instead, e.g.
243 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
244 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
246 # If $(quiet) is empty, the whole command will be printed.
247 # If it is set to "quiet_", only the short version will be printed.
248 # If it is set to "silent_", nothing will be printed at all, since
249 # the variable $(silent_cmd_cc_o_c) doesn't exist.
251 # A simple variant is to prefix commands with $(Q) - that's useful
252 # for commands that shall be hidden in non-verbose mode.
256 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
257 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
259 ifeq ($(KBUILD_VERBOSE),1)
267 # If the user is running make -s (silent mode), suppress echoing of
270 ifneq ($(findstring s,$(MAKEFLAGS)),)
274 export quiet Q KBUILD_VERBOSE
277 # Look for make include files relative to root of kernel src
278 MAKEFLAGS += --include-dir=$(srctree)
280 # We need some generic definitions.
281 include $(srctree)/scripts/Kbuild.include
283 # Make variables (CC, etc...)
285 AS = $(CROSS_COMPILE)as
286 LD = $(CROSS_COMPILE)ld
287 CC = $(CROSS_COMPILE)gcc
289 AR = $(CROSS_COMPILE)ar
290 NM = $(CROSS_COMPILE)nm
291 STRIP = $(CROSS_COMPILE)strip
292 OBJCOPY = $(CROSS_COMPILE)objcopy
293 OBJDUMP = $(CROSS_COMPILE)objdump
295 GENKSYMS = scripts/genksyms/genksyms
296 DEPMOD = /sbin/depmod
297 KALLSYMS = scripts/kallsyms
301 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
303 CFLAGS_MODULE = $(MODFLAGS)
304 AFLAGS_MODULE = $(MODFLAGS)
310 # Use LINUXINCLUDE when you must reference the include/ directory.
311 # Needed to be compatible with the O= option
312 LINUXINCLUDE := -Iinclude \
313 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
314 -include include/linux/autoconf.h
316 CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
318 CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
319 -fno-strict-aliasing -fno-common \
320 -Werror-implicit-function-declaration
321 AFLAGS := -D__ASSEMBLY__
323 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
324 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
325 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
327 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
328 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
329 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
330 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
332 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
333 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
334 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
336 # When compiling out-of-tree modules, put MODVERDIR in the module
337 # tree rather than in the kernel tree. The kernel tree might
339 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
341 # Files to ignore in find ... statements
343 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
344 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
346 # ===========================================================================
347 # Rules shared between *config targets and build targets
349 # Basic helpers built in scripts/
350 PHONY += scripts_basic
352 $(Q)$(MAKE) $(build)=scripts/basic
354 # To avoid any implicit rule to kick in, define an empty command.
355 scripts/basic/%: scripts_basic ;
357 PHONY += outputmakefile
358 # outputmakefile generates a Makefile in the output directory, if using a
359 # separate output directory. This allows convenient use of make in the
362 ifneq ($(KBUILD_SRC),)
363 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
364 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
367 # To make sure we do not include .config for any of the *config targets
368 # catch them early, and hand them over to scripts/kconfig/Makefile
369 # It is allowed to specify more targets when calling make, including
370 # mixing *config targets and build targets.
371 # For example 'make oldconfig all'.
372 # Detect when mixed targets is specified, and make a second invocation
373 # of make so .config is not included in this case either (for *config).
375 no-dot-config-targets := clean mrproper distclean \
376 cscope TAGS tags help %docs check% \
377 include/linux/version.h headers_% \
378 kernelrelease kernelversion
384 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
385 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
390 ifeq ($(KBUILD_EXTMOD),)
391 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
393 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
399 ifeq ($(mixed-targets),1)
400 # ===========================================================================
401 # We're called with mixed targets (*config and build targets).
402 # Handle them one by one.
405 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
408 ifeq ($(config-targets),1)
409 # ===========================================================================
410 # *config targets only - make sure prerequisites are updated, and descend
411 # in scripts/kconfig to make the *config target
413 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
414 # KBUILD_DEFCONFIG may point out an alternative default configuration
415 # used for 'make defconfig'
416 include $(srctree)/arch/$(ARCH)/Makefile
417 export KBUILD_DEFCONFIG
419 config %config: scripts_basic outputmakefile FORCE
420 $(Q)mkdir -p include/linux include/config
421 $(Q)$(MAKE) $(build)=scripts/kconfig $@
424 # ===========================================================================
425 # Build targets only - this includes vmlinux, arch specific targets, clean
426 # targets and others. In general all targets except *config targets.
428 ifeq ($(KBUILD_EXTMOD),)
429 # Additional helpers built in scripts/
430 # Carefully list dependencies so we do not try to build scripts twice
433 scripts: scripts_basic include/config/auto.conf
434 $(Q)$(MAKE) $(build)=$(@)
436 # Objects we will link into vmlinux / subdirs we need to visit
438 drivers-y := drivers/ sound/
442 endif # KBUILD_EXTMOD
444 ifeq ($(dot-config),1)
446 -include include/config/auto.conf
448 ifeq ($(KBUILD_EXTMOD),)
449 # Read in dependencies to all Kconfig* files, make sure to run
450 # oldconfig if changes are detected.
451 -include include/config/auto.conf.cmd
453 # To avoid any implicit rule to kick in, define an empty command
454 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
456 # If .config is newer than include/config/auto.conf, someone tinkered
457 # with it and forgot to run make oldconfig.
458 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
459 # we execute the config step to be sure to catch updated Kconfig files
460 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
461 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
463 # external modules needs include/linux/autoconf.h and include/config/auto.conf
464 # but do not care if they are up-to-date. Use auto.conf to trigger the test
465 PHONY += include/config/auto.conf
467 include/config/auto.conf:
468 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
470 echo " ERROR: Kernel configuration is invalid."; \
471 echo " include/linux/autoconf.h or $@ are missing."; \
472 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
476 endif # KBUILD_EXTMOD
479 # Dummy target needed, because used as prerequisite
480 include/config/auto.conf: ;
481 endif # $(dot-config)
483 # The all: target is the default when no target is given on the
485 # This allow a user to issue only 'make' to build a kernel including modules
486 # Defaults vmlinux but it is usually overridden in the arch makefile
489 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
495 include $(srctree)/arch/$(ARCH)/Makefile
497 ifdef CONFIG_FRAME_POINTER
498 CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
500 CFLAGS += -fomit-frame-pointer
503 ifdef CONFIG_DEBUG_INFO
508 # Force gcc to behave correct even for buggy distributions
509 CFLAGS += $(call cc-option, -fno-stack-protector)
511 # arch Makefile may override CC so keep this after arch Makefile is included
512 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
513 CHECKFLAGS += $(NOSTDINC_FLAGS)
515 # warn about C99 declaration after statement
516 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
518 # disable pointer signed / unsigned warnings in gcc 4.0
519 CFLAGS += $(call cc-option,-Wno-pointer-sign,)
521 # Use --build-id when available.
522 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
523 $(call ld-option, -Wl$(comma)--build-id,))
524 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
525 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
527 # Default kernel image to build when no specific target is given.
528 # KBUILD_IMAGE may be overruled on the command line or
529 # set in the environment
530 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
532 export KBUILD_IMAGE ?= vmlinux
535 # INSTALL_PATH specifies where to place the updated kernel and system map
536 # images. Default is /boot, but you can set it to other values
537 export INSTALL_PATH ?= /boot
540 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
541 # relocations required by build roots. This is not defined in the
542 # makefile but the argument can be passed to make if needed.
545 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
549 # INSTALL_MOD_STRIP, if defined, will cause modules to be
550 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
551 # the default option --strip-debug will be used. Otherwise,
552 # INSTALL_MOD_STRIP will used as the options to the strip command.
554 ifdef INSTALL_MOD_STRIP
555 ifeq ($(INSTALL_MOD_STRIP),1)
556 mod_strip_cmd = $(STRIP) --strip-debug
558 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
559 endif # INSTALL_MOD_STRIP=1
562 endif # INSTALL_MOD_STRIP
566 ifeq ($(KBUILD_EXTMOD),)
567 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
569 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
570 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
571 $(net-y) $(net-m) $(libs-y) $(libs-m)))
573 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
575 $(core-n) $(core-) $(drivers-n) $(drivers-) \
576 $(net-n) $(net-) $(libs-n) $(libs-))))
578 init-y := $(patsubst %/, %/built-in.o, $(init-y))
579 core-y := $(patsubst %/, %/built-in.o, $(core-y))
580 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
581 net-y := $(patsubst %/, %/built-in.o, $(net-y))
582 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
583 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
584 libs-y := $(libs-y1) $(libs-y2)
587 # ---------------------------------------------------------------------------
588 # vmlinux is built from the objects selected by $(vmlinux-init) and
589 # $(vmlinux-main). Most are built-in.o files from top-level directories
590 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
591 # Ordering when linking is important, and $(vmlinux-init) must be first.
596 # +-< $(vmlinux-init)
597 # | +--< init/version.o + more
599 # +--< $(vmlinux-main)
600 # | +--< driver/built-in.o mm/built-in.o + more
602 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
604 # vmlinux version (uname -v) cannot be updated during normal
605 # descending-into-subdirs phase since we do not yet know if we need to
607 # Therefore this step is delayed until just before final link of vmlinux -
608 # except in the kallsyms case where it is done just before adding the
609 # symbols to the kernel.
611 # System.map is generated to document addresses of all kernel symbols
613 vmlinux-init := $(head-y) $(init-y)
614 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
615 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
616 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
617 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
619 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
620 # May be overridden by arch/$(ARCH)/Makefile
621 quiet_cmd_vmlinux__ ?= LD $@
622 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
623 -T $(vmlinux-lds) $(vmlinux-init) \
624 --start-group $(vmlinux-main) --end-group \
625 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
627 # Generate new vmlinux version
628 quiet_cmd_vmlinux_version = GEN .version
629 cmd_vmlinux_version = set -e; \
630 if [ ! -r .version ]; then \
634 mv .version .old_version; \
635 expr 0$$(cat .old_version) + 1 >.version; \
637 $(MAKE) $(build)=init
639 # Generate System.map
640 quiet_cmd_sysmap = SYSMAP
641 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
644 # If CONFIG_KALLSYMS is set .version is already updated
645 # Generate System.map and verify that the content is consistent
646 # Use + in front of the vmlinux_version rule to silent warning with make -j2
647 # First command is ':' to allow us to use + in front of the rule
648 define rule_vmlinux__
650 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
652 $(call cmd,vmlinux__)
653 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
655 $(Q)$(if $($(quiet)cmd_sysmap), \
656 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
657 $(cmd_sysmap) $@ System.map; \
658 if [ $$? -ne 0 ]; then \
666 ifdef CONFIG_KALLSYMS
667 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
668 # It's a three stage process:
669 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
671 # Running kallsyms on that gives us .tmp_kallsyms1.o with
672 # the right size - vmlinux version (uname -v) is updated during this step
673 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
674 # but due to the added section, some addresses have shifted.
675 # From here, we generate a correct .tmp_kallsyms2.o
676 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
677 # o Verify that the System.map from vmlinux matches the map from
678 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
679 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
680 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
681 # temporary bypass to allow the kernel to be built while the
682 # maintainers work out what went wrong with kallsyms.
684 ifdef CONFIG_KALLSYMS_EXTRA_PASS
690 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
692 define verify_kallsyms
693 $(Q)$(if $($(quiet)cmd_sysmap), \
694 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
695 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
696 $(Q)cmp -s System.map .tmp_System.map || \
697 (echo Inconsistent kallsyms data; \
698 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
699 rm .tmp_kallsyms* ; /bin/false )
702 # Update vmlinux version before link
703 # Use + in front of this rule to silent warning about make -j1
704 # First command is ':' to allow us to use + in front of this rule
705 cmd_ksym_ld = $(cmd_vmlinux__)
708 +$(call cmd,vmlinux_version)
709 $(call cmd,vmlinux__)
710 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
713 # Generate .S file with all kernel symbols
714 quiet_cmd_kallsyms = KSYM $@
715 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
716 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
718 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
719 $(call if_changed_dep,as_o_S)
721 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
724 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
725 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
726 $(call if_changed_rule,ksym_ld)
728 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
729 $(call if_changed,vmlinux__)
731 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
732 $(call if_changed,vmlinux__)
734 # Needs to visit scripts/ before $(KALLSYMS) can be used.
735 $(KALLSYMS): scripts ;
737 # Generate some data for debugging strange kallsyms problems
738 debug_kallsyms: .tmp_map$(last_kallsyms)
740 .tmp_map%: .tmp_vmlinux% FORCE
741 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
747 endif # ifdef CONFIG_KALLSYMS
749 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
750 # relevant sections renamed as per the linker script.
751 quiet_cmd_vmlinux-modpost = LD $@
752 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
753 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
754 $(filter-out $(vmlinux-init) $(vmlinux-main) $(vmlinux-lds) FORCE ,$^)
755 define rule_vmlinux-modpost
757 +$(call cmd,vmlinux-modpost)
758 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
759 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
762 # vmlinux image - including updated kernel symbols
763 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o FORCE
764 ifdef CONFIG_HEADERS_CHECK
765 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
767 $(call vmlinux-modpost)
768 $(call if_changed_rule,vmlinux__)
769 $(Q)rm -f .old_version
771 vmlinux.o: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) FORCE
772 $(call if_changed_rule,vmlinux-modpost)
774 # The actual objects are generated when descending,
775 # make sure no implicit rule kicks in
776 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
778 # Handle descending into subdirectories listed in $(vmlinux-dirs)
779 # Preset locale variables to speed up the build process. Limit locale
780 # tweaks to this spot to avoid wrong language settings when running
781 # make menuconfig etc.
782 # Error messages still appears in the original language
784 PHONY += $(vmlinux-dirs)
785 $(vmlinux-dirs): prepare scripts
786 $(Q)$(MAKE) $(build)=$@
788 # Build the kernel release string
790 # The KERNELRELEASE value built here is stored in the file
791 # include/config/kernel.release, and is used when executing several
792 # make targets, such as "make install" or "make modules_install."
794 # The eventual kernel release string consists of the following fields,
795 # shown in a hierarchical format to show how smaller parts are concatenated
796 # to form the larger and final value, with values coming from places like
797 # the Makefile, kernel config options, make command line options and/or
798 # SCM tag information.
802 # $(PATCHLEVEL) eg, 6
804 # $(EXTRAVERSION) eg, -rc6
807 # localversion* (files without backups, containing '~')
808 # $(CONFIG_LOCALVERSION) (from kernel config setting)
809 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
810 # ./scripts/setlocalversion (SCM tag, if one exists)
811 # $(LOCALVERSION) (from make command line if provided)
813 # Note how the final $(localver-auto) string is included *only* if the
814 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
815 # moment, only git is supported but other SCMs can edit the script
816 # scripts/setlocalversion and add the appropriate checks as needed.
818 pattern = ".*/localversion[^~]*"
819 string = $(shell cat /dev/null \
820 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
822 localver = $(subst $(space),, $(string) \
823 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
825 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
826 # and if the SCM is know a tag from the SCM is appended.
827 # The appended tag is determined by the SCM used.
829 # Currently, only git is supported.
830 # Other SCMs can edit scripts/setlocalversion and add the appropriate
832 ifdef CONFIG_LOCALVERSION_AUTO
833 _localver-auto = $(shell $(CONFIG_SHELL) \
834 $(srctree)/scripts/setlocalversion $(srctree))
835 localver-auto = $(LOCALVERSION)$(_localver-auto)
838 localver-full = $(localver)$(localver-auto)
840 # Store (new) KERNELRELASE string in include/config/kernel.release
841 kernelrelease = $(KERNELVERSION)$(localver-full)
842 include/config/kernel.release: include/config/auto.conf FORCE
844 $(Q)echo $(kernelrelease) > $@
847 # Things we need to do before we recursively start building the kernel
848 # or the modules are listed in "prepare".
849 # A multi level approach is used. prepareN is processed before prepareN-1.
850 # archprepare is used in arch Makefiles and when processed asm symlink,
851 # version.h and scripts_basic is processed / created.
853 # Listed in dependency order
854 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
856 # prepare3 is used to check if we are building in a separate output directory,
858 # 1) Check that make has not been executed in the kernel src $(srctree)
859 # 2) Create the include2 directory, used for the second asm symlink
860 prepare3: include/config/kernel.release
861 ifneq ($(KBUILD_SRC),)
862 @echo ' Using $(srctree) as source for kernel'
863 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
864 echo " $(srctree) is not clean, please run 'make mrproper'";\
865 echo " in the '$(srctree)' directory.";\
868 $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
869 $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
872 # prepare2 creates a makefile if using a separate output directory
873 prepare2: prepare3 outputmakefile
875 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
876 include/asm include/config/auto.conf
877 ifneq ($(KBUILD_MODULES),)
878 $(Q)mkdir -p $(MODVERDIR)
879 $(Q)rm -f $(MODVERDIR)/*
882 archprepare: prepare1 scripts_basic
884 prepare0: archprepare FORCE
885 $(Q)$(MAKE) $(build)=.
886 $(Q)$(MAKE) $(build)=. missing-syscalls
888 # All the preparing..
891 # Leave this as default for preprocessing vmlinux.lds.S, which is now
892 # done in arch/$(ARCH)/kernel/Makefile
894 export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
896 # FIXME: The asm symlink changes when $(ARCH) changes. That's
897 # hard to detect, but I suppose "make mrproper" is a good idea
898 # before switching between archs anyway.
901 @echo ' SYMLINK $@ -> include/asm-$(SRCARCH)'
902 $(Q)if [ ! -d include ]; then mkdir -p include; fi;
903 @ln -fsn asm-$(SRCARCH) $@
905 # Generate some files
906 # ---------------------------------------------------------------------------
908 # KERNELRELEASE can change from a few different places, meaning version.h
909 # needs to be updated, so this check is forced on all builds
912 define filechk_utsrelease.h
913 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
914 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
917 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
920 define filechk_version.h
921 (echo \#define LINUX_VERSION_CODE $(shell \
922 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
923 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
926 include/linux/version.h: $(srctree)/Makefile FORCE
927 $(call filechk,version.h)
929 include/linux/utsrelease.h: include/config/kernel.release FORCE
930 $(call filechk,utsrelease.h)
932 # ---------------------------------------------------------------------------
936 @echo '*** Warning: make $@ is unnecessary now.'
938 # ---------------------------------------------------------------------------
940 INSTALL_HDR_PATH=$(objtree)/usr
941 export INSTALL_HDR_PATH
943 HDRFILTER=generic i386 x86_64
944 HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
946 PHONY += headers_install_all
947 headers_install_all: include/linux/version.h scripts_basic FORCE
948 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
949 $(Q)for arch in $(HDRARCHES); do \
950 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
953 PHONY += headers_install
954 headers_install: include/linux/version.h scripts_basic FORCE
955 @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
956 echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
958 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
959 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
961 PHONY += headers_check_all
962 headers_check_all: headers_install_all
963 $(Q)for arch in $(HDRARCHES); do \
964 $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
967 PHONY += headers_check
968 headers_check: headers_install
969 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
971 # ---------------------------------------------------------------------------
976 # By default, build modules as well
983 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
984 @echo ' Building modules, stage 2.';
985 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
988 # Target to prepare building external modules
989 PHONY += modules_prepare
990 modules_prepare: prepare scripts
992 # Target to install modules
993 PHONY += modules_install
994 modules_install: _modinst_ _modinst_post
998 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
999 echo "Warning: you may need to install module-init-tools"; \
1000 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1003 @rm -rf $(MODLIB)/kernel
1004 @rm -f $(MODLIB)/source
1005 @mkdir -p $(MODLIB)/kernel
1006 @ln -s $(srctree) $(MODLIB)/source
1007 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1008 rm -f $(MODLIB)/build ; \
1009 ln -s $(objtree) $(MODLIB)/build ; \
1011 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1013 # If System.map exists, run depmod. This deliberately does not have a
1014 # dependency on System.map since that would run the dependency tree on
1015 # vmlinux. This depmod is only for convenience to give the initial
1016 # boot a modules.dep even before / is mounted read-write. However the
1017 # boot script depmod is the master version.
1018 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
1021 depmod_opts := -b $(INSTALL_MOD_PATH) -r
1023 PHONY += _modinst_post
1024 _modinst_post: _modinst_
1025 if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
1027 else # CONFIG_MODULES
1029 # Modules not configured
1030 # ---------------------------------------------------------------------------
1032 modules modules_install: FORCE
1034 @echo "The present kernel configuration has modules disabled."
1035 @echo "Type 'make config' and enable loadable module support."
1036 @echo "Then build a kernel with module support enabled."
1040 endif # CONFIG_MODULES
1043 # Cleaning is done on three levels.
1044 # make clean Delete most generated files
1045 # Leave enough to build external modules
1046 # make mrproper Delete the current configuration, and all generated files
1047 # make distclean Remove editor backup files, patch leftover files and the like
1049 # Directories & files removed with 'make clean'
1050 CLEAN_DIRS += $(MODVERDIR)
1051 CLEAN_FILES += vmlinux System.map \
1052 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1054 # Directories & files removed with 'make mrproper'
1055 MRPROPER_DIRS += include/config include2 usr/include
1056 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1057 include/linux/autoconf.h include/linux/version.h \
1058 include/linux/utsrelease.h \
1059 Module.symvers tags TAGS cscope*
1061 # clean - Delete most, but leave enough to build external modules
1063 clean: rm-dirs := $(CLEAN_DIRS)
1064 clean: rm-files := $(CLEAN_FILES)
1065 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
1067 PHONY += $(clean-dirs) clean archclean
1069 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1071 clean: archclean $(clean-dirs)
1074 @find . $(RCS_FIND_IGNORE) \
1075 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1076 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1077 -o -name '*.symtypes' \) \
1078 -type f -print | xargs rm -f
1080 # mrproper - Delete all generated files, including .config
1082 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1083 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1084 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1086 PHONY += $(mrproper-dirs) mrproper archmrproper
1088 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1090 mrproper: clean archmrproper $(mrproper-dirs)
1099 @find $(srctree) $(RCS_FIND_IGNORE) \
1100 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1101 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1102 -o -name '.*.rej' -o -size 0 \
1103 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1104 -type f -print | xargs rm -f
1107 # Packaging of the kernel to various formats
1108 # ---------------------------------------------------------------------------
1109 # rpm target kept for backward compatibility
1110 package-dir := $(srctree)/scripts/package
1112 %pkg: include/config/kernel.release FORCE
1113 $(Q)$(MAKE) $(build)=$(package-dir) $@
1114 rpm: include/config/kernel.release FORCE
1115 $(Q)$(MAKE) $(build)=$(package-dir) $@
1118 # Brief documentation of the typical targets used
1119 # ---------------------------------------------------------------------------
1121 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
1122 boards := $(notdir $(boards))
1125 @echo 'Cleaning targets:'
1126 @echo ' clean - Remove most generated files but keep the config and'
1127 @echo ' enough build support to build external modules'
1128 @echo ' mrproper - Remove all generated files + config + various backup files'
1129 @echo ' distclean - mrproper + remove editor backup and patch files'
1131 @echo 'Configuration targets:'
1132 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1134 @echo 'Other generic targets:'
1135 @echo ' all - Build all targets marked with [*]'
1136 @echo '* vmlinux - Build the bare kernel'
1137 @echo '* modules - Build all modules'
1138 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1139 @echo ' dir/ - Build all files in dir and below'
1140 @echo ' dir/file.[ois] - Build specified target only'
1141 @echo ' dir/file.ko - Build module including final link'
1142 @echo ' rpm - Build a kernel as an RPM package'
1143 @echo ' tags/TAGS - Generate tags file for editors'
1144 @echo ' cscope - Generate cscope index'
1145 @echo ' kernelrelease - Output the release version string'
1146 @echo ' kernelversion - Output the version stored in Makefile'
1147 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1148 echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1149 echo ' (default: $(INSTALL_HDR_PATH))'; \
1152 @echo 'Static analysers'
1153 @echo ' checkstack - Generate a list of stack hogs'
1154 @echo ' namespacecheck - Name space analysis on compiled kernel'
1155 @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
1156 echo ' headers_check - Sanity check on exported headers'; \
1159 @echo 'Kernel packaging:'
1160 @$(MAKE) $(build)=$(package-dir) help
1162 @echo 'Documentation targets:'
1163 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1165 @echo 'Architecture specific targets ($(ARCH)):'
1166 @$(if $(archhelp),$(archhelp),\
1167 echo ' No architecture specific help defined for $(ARCH)')
1170 $(foreach b, $(boards), \
1171 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1174 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1175 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1176 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1177 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1178 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1180 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1181 @echo 'For further info see the ./README file'
1184 # Documentation targets
1185 # ---------------------------------------------------------------------------
1186 %docs: scripts_basic FORCE
1187 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1189 else # KBUILD_EXTMOD
1192 # External module support.
1193 # When building external modules the kernel used as basis is considered
1194 # read-only, and no consistency checks are made and the make
1195 # system is not used on the basis kernel. If updates are required
1196 # in the basis kernel ordinary make commands (without M=...) must
1199 # The following are the only valid targets when building external
1201 # make M=dir clean Delete all automatically generated files
1202 # make M=dir modules Make all modules in specified dir
1203 # make M=dir Same as 'make M=dir modules'
1204 # make M=dir modules_install
1205 # Install the modules built in the module directory
1206 # Assumes install directory is already created
1208 # We are always building modules
1210 PHONY += crmodverdir
1212 $(Q)mkdir -p $(MODVERDIR)
1213 $(Q)rm -f $(MODVERDIR)/*
1215 PHONY += $(objtree)/Module.symvers
1216 $(objtree)/Module.symvers:
1217 @test -e $(objtree)/Module.symvers || ( \
1219 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1220 echo " is missing; modules will have no dependencies and modversions."; \
1223 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1224 PHONY += $(module-dirs) modules
1225 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1226 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1228 modules: $(module-dirs)
1229 @echo ' Building modules, stage 2.';
1230 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1232 PHONY += modules_install
1233 modules_install: _emodinst_ _emodinst_post
1235 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1238 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1239 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1241 # Run depmod only is we have System.map and depmod is executable
1242 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1243 cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
1244 $(DEPMOD) -ae -F System.map \
1245 $(if $(strip $(INSTALL_MOD_PATH)), \
1246 -b $(INSTALL_MOD_PATH) -r) \
1250 PHONY += _emodinst_post
1251 _emodinst_post: _emodinst_
1254 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1256 PHONY += $(clean-dirs) clean
1258 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1260 clean: rm-dirs := $(MODVERDIR)
1261 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1262 clean: $(clean-dirs)
1265 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1266 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1267 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
1268 -type f -print | xargs rm -f
1271 @echo ' Building external modules.'
1272 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1274 @echo ' modules - default target, build the module(s)'
1275 @echo ' modules_install - install the module'
1276 @echo ' clean - remove generated files in module directory only'
1280 PHONY += prepare scripts
1283 endif # KBUILD_EXTMOD
1285 # Generate tags for editors
1286 # ---------------------------------------------------------------------------
1288 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1289 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1290 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1292 ifeq ($(src),$(obj))
1295 __srctree = $(srctree)/
1298 ifeq ($(ALLSOURCE_ARCHS),)
1300 ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
1302 ALLINCLUDE_ARCHS := $(SRCARCH)
1305 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behavour.
1306 ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
1309 # Take care of arch/x86
1310 ifeq ($(ARCH), $(SRCARCH))
1311 ALLSOURCE_ARCHS := $(ARCH)
1313 ALLSOURCE_ARCHS := $(ARCH) $(SRCARCH)
1317 ( for ARCH in $(ALLSOURCE_ARCHS) ; do \
1318 find $(__srctree)arch/$${SRCARCH} $(RCS_FIND_IGNORE) \
1321 find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
1323 find $(__srctree)include $(RCS_FIND_IGNORE) \
1324 \( -name config -o -name 'asm-*' \) -prune \
1325 -o -name $1 -print; \
1326 for ARCH in $(ALLINCLUDE_ARCHS) ; do \
1327 find $(__srctree)include/asm-$${SRCARCH} $(RCS_FIND_IGNORE) \
1330 find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
1332 find $(__srctree) $(RCS_FIND_IGNORE) \
1333 \( -name include -o -name arch \) -prune -o \
1339 $(call find-sources,'*.[chS]')
1342 $(call find-sources,'Kconfig*')
1344 define all-defconfigs
1345 $(call find-sources,'defconfig')
1349 if $1 --version 2>&1 | grep -iq exuberant; then \
1350 $(all-sources) | xargs $1 -a \
1351 -I __initdata,__exitdata,__acquires,__releases \
1352 -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
1353 --extra=+f --c-kinds=+px \
1354 --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
1355 $(all-kconfigs) | xargs $1 -a \
1357 --language-force=kconfig \
1358 --regex-kconfig='/^[[:blank:]]*config[[:blank:]]+([[:alnum:]_]+)/\1/'; \
1359 $(all-defconfigs) | xargs -r $1 -a \
1360 --langdef=dotconfig \
1361 --language-force=dotconfig \
1362 --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1363 elif $1 --version 2>&1 | grep -iq emacs; then \
1364 $(all-sources) | xargs $1 -a; \
1365 $(all-kconfigs) | xargs $1 -a \
1366 --regex='/^[ \t]*config[ \t]+\([a-zA-Z0-9_]+\)/\1/'; \
1367 $(all-defconfigs) | xargs -r $1 -a \
1368 --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1370 $(all-sources) | xargs $1 -a; \
1374 quiet_cmd_cscope-file = FILELST cscope.files
1375 cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
1377 quiet_cmd_cscope = MAKE cscope.out
1378 cmd_cscope = cscope -b
1381 $(call cmd,cscope-file)
1384 quiet_cmd_TAGS = MAKE $@
1393 quiet_cmd_tags = MAKE $@
1403 # Scripts to check various things for consistency
1404 # ---------------------------------------------------------------------------
1407 find * $(RCS_FIND_IGNORE) \
1408 -name '*.[hcS]' -type f -print | sort \
1409 | xargs $(PERL) -w scripts/checkincludes.pl
1412 find * $(RCS_FIND_IGNORE) \
1413 -name '*.[hcS]' -type f -print | sort \
1414 | xargs $(PERL) -w scripts/checkversion.pl
1417 $(PERL) $(srctree)/scripts/namespace.pl
1419 endif #ifeq ($(config-targets),1)
1420 endif #ifeq ($(mixed-targets),1)
1422 PHONY += checkstack kernelrelease kernelversion
1424 # UML needs a little special treatment here. It wants to use the host
1425 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1426 # else wants $(ARCH), including people doing cross-builds, which means
1427 # that $(SUBARCH) doesn't work here.
1429 CHECKSTACK_ARCH := $(SUBARCH)
1431 CHECKSTACK_ARCH := $(ARCH)
1434 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1435 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1438 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1439 $(error kernelrelease not valid - run 'make prepare' to update it))
1441 @echo $(KERNELVERSION)
1444 # ---------------------------------------------------------------------------
1445 # Single targets are compatible with:
1446 # - build whith mixed source and output
1447 # - build with separate output dir 'make O=...'
1448 # - external modules
1450 # target-dir => where to store outputfile
1451 # build-dir => directory in kernel source tree to use
1453 ifeq ($(KBUILD_EXTMOD),)
1454 build-dir = $(patsubst %/,%,$(dir $@))
1455 target-dir = $(dir $@)
1457 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1458 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1459 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1462 %.s: %.c prepare scripts FORCE
1463 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1464 %.i: %.c prepare scripts FORCE
1465 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1466 %.o: %.c prepare scripts FORCE
1467 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1468 %.lst: %.c prepare scripts FORCE
1469 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1470 %.s: %.S prepare scripts FORCE
1471 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1472 %.o: %.S prepare scripts FORCE
1473 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1474 %.symtypes: %.c prepare scripts FORCE
1475 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1478 / %/: prepare scripts FORCE
1479 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1480 $(build)=$(build-dir)
1481 %.ko: prepare scripts FORCE
1482 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1483 $(build)=$(build-dir) $(@:.ko=.o)
1484 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1486 # FIXME Should go into a make.lib or something
1487 # ===========================================================================
1489 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1490 cmd_rmdirs = rm -rf $(rm-dirs)
1492 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1493 cmd_rmfiles = rm -f $(rm-files)
1496 a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
1497 $(NOSTDINC_FLAGS) $(CPPFLAGS) \
1498 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1500 quiet_cmd_as_o_S = AS $@
1501 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1503 # read all saved command lines
1505 targets := $(wildcard $(sort $(targets)))
1506 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1508 ifneq ($(cmd_files),)
1509 $(cmd_files): ; # Do not try to update included dependency files
1510 include $(cmd_files)
1513 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1515 # $(Q)$(MAKE) $(clean)=dir
1516 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1518 endif # skip-makefile
1523 # Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes.
1526 # Declare the contents of the .PHONY variable as phony. We keep that
1527 # information in a variable se we can use it in if_changed and friends.