5 NAME = Flesh-Eating Bats with Fangs
8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
14 # o use make's built-in rules and variables
15 # (this increases performance and avoids hard-to-debug behaviour);
16 # o print "Entering directory ...";
17 MAKEFLAGS += -rR --no-print-directory
19 # Avoid funny character set dependencies
23 export LC_COLLATE LC_NUMERIC
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.o targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
41 # To put more focus on warnings, be less verbose as default
42 # Use 'make V=1' to see the full commands
44 ifeq ("$(origin V)", "command line")
51 # Call a source code checker (by default, "sparse") as part of the
54 # Use 'make C=1' to enable checking of only re-compiled files.
55 # Use 'make C=2' to enable checking of *all* source files, regardless
56 # of whether they are re-compiled or not.
58 # See the file "Documentation/sparse.txt" for more details, including
59 # where to get the "sparse" utility.
61 ifeq ("$(origin C)", "command line")
62 KBUILD_CHECKSRC = $(C)
64 ifndef KBUILD_CHECKSRC
68 # Use make M=dir to specify directory of external module to build
69 # Old syntax make ... SUBDIRS=$PWD is still supported
70 # Setting the environment variable KBUILD_EXTMOD take precedence
72 KBUILD_EXTMOD ?= $(SUBDIRS)
75 ifeq ("$(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?
101 ifeq ("$(origin O)", "command line")
102 KBUILD_OUTPUT := $(O)
105 ifeq ("$(origin W)", "command line")
106 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := 1
109 # That's our default target when none is given on the command line
113 # Cancel implicit rules on top Makefile
114 $(CURDIR)/Makefile Makefile: ;
116 ifneq ($(KBUILD_OUTPUT),)
117 # Invoke a second make in the output directory, passing relevant variables
118 # check that the output directory actually exists
119 saved-output := $(KBUILD_OUTPUT)
120 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
121 $(if $(KBUILD_OUTPUT),, \
122 $(error output directory "$(saved-output)" does not exist))
124 PHONY += $(MAKECMDGOALS) sub-make
126 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
130 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
131 KBUILD_SRC=$(CURDIR) \
132 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
133 $(filter-out _all sub-make,$(MAKECMDGOALS))
135 # Leave processing to above invocation of make
137 endif # ifneq ($(KBUILD_OUTPUT),)
138 endif # ifeq ($(KBUILD_SRC),)
140 # We process the rest of the Makefile if this is the final invocation of make
141 ifeq ($(skip-makefile),)
143 # If building an external module we do not care about the all: rule
144 # but instead _all depend on modules
146 ifeq ($(KBUILD_EXTMOD),)
152 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
157 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
159 export srctree objtree VPATH
162 # SUBARCH tells the usermode build what the underlying arch is. That is set
163 # first, and if a usermode build is happening, the "ARCH=um" on the command
164 # line overrides the setting of ARCH below. If a native build is happening,
165 # then ARCH is assigned, getting whatever value it gets normally, and
166 # SUBARCH is subsequently ignored.
168 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
169 -e s/arm.*/arm/ -e s/sa110/arm/ \
170 -e s/s390x/s390/ -e s/parisc64/parisc/ \
171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
174 # Cross compiling and selecting different set of gcc/bin-utils
175 # ---------------------------------------------------------------------------
177 # When performing cross compilation for other architectures ARCH shall be set
178 # to the target architecture. (See arch/* for the possibilities).
179 # ARCH can be set during invocation of make:
181 # Another way is to have ARCH set in the environment.
182 # The default ARCH is the host where make is executed.
184 # CROSS_COMPILE specify the prefix used for all executables used
185 # during compilation. Only gcc and related bin-utils executables
186 # are prefixed with $(CROSS_COMPILE).
187 # CROSS_COMPILE can be set on the command line
188 # make CROSS_COMPILE=ia64-linux-
189 # Alternatively CROSS_COMPILE can be set in the environment.
190 # A third alternative is to store a setting in .config so that plain
191 # "make" in the configured kernel build directory always uses that.
192 # Default value for CROSS_COMPILE is not to prefix executables
193 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
194 export KBUILD_BUILDHOST := $(SUBARCH)
196 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
198 # Architecture as present in compile.h
199 UTS_MACHINE := $(ARCH)
202 # Additional ARCH settings for x86
206 ifeq ($(ARCH),x86_64)
210 # Additional ARCH settings for sparc
211 ifeq ($(ARCH),sparc32)
214 ifeq ($(ARCH),sparc64)
218 # Additional ARCH settings for sh
223 # Where to locate arch specific headers
224 hdr-arch := $(SRCARCH)
226 ifeq ($(ARCH),m68knommu)
230 KCONFIG_CONFIG ?= .config
231 export KCONFIG_CONFIG
233 # SHELL used by kbuild
234 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
235 else if [ -x /bin/bash ]; then echo /bin/bash; \
236 else echo sh; fi ; fi)
240 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
243 # Decide whether to build built-in, modular, or both.
244 # Normally, just do built-in.
249 # If we have only "make modules", don't compile built-in objects.
250 # When we're building modules with modversions, we need to consider
251 # the built-in objects during the descend as well, in order to
252 # make sure the checksums are up to date before we record them.
254 ifeq ($(MAKECMDGOALS),modules)
255 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
258 # If we have "make <whatever> modules", compile modules
259 # in addition to whatever we do anyway.
260 # Just "make" or "make all" shall build modules as well
262 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
266 ifeq ($(MAKECMDGOALS),)
270 export KBUILD_MODULES KBUILD_BUILTIN
271 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
274 # ---------------------------------------------------------------------------
276 # Normally, we echo the whole command before executing it. By making
277 # that echo $($(quiet)$(cmd)), we now have the possibility to set
278 # $(quiet) to choose other forms of output instead, e.g.
280 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
281 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
283 # If $(quiet) is empty, the whole command will be printed.
284 # If it is set to "quiet_", only the short version will be printed.
285 # If it is set to "silent_", nothing will be printed at all, since
286 # the variable $(silent_cmd_cc_o_c) doesn't exist.
288 # A simple variant is to prefix commands with $(Q) - that's useful
289 # for commands that shall be hidden in non-verbose mode.
293 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
294 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
296 ifeq ($(KBUILD_VERBOSE),1)
304 # If the user is running make -s (silent mode), suppress echoing of
307 ifneq ($(findstring s,$(MAKEFLAGS)),)
311 export quiet Q KBUILD_VERBOSE
314 # Look for make include files relative to root of kernel src
315 MAKEFLAGS += --include-dir=$(srctree)
317 # We need some generic definitions (do not try to remake the file).
318 $(srctree)/scripts/Kbuild.include: ;
319 include $(srctree)/scripts/Kbuild.include
321 # Make variables (CC, etc...)
323 AS = $(CROSS_COMPILE)as
324 LD = $(CROSS_COMPILE)ld
325 CC = $(CROSS_COMPILE)gcc
327 AR = $(CROSS_COMPILE)ar
328 NM = $(CROSS_COMPILE)nm
329 STRIP = $(CROSS_COMPILE)strip
330 OBJCOPY = $(CROSS_COMPILE)objcopy
331 OBJDUMP = $(CROSS_COMPILE)objdump
333 GENKSYMS = scripts/genksyms/genksyms
334 INSTALLKERNEL := installkernel
335 DEPMOD = /sbin/depmod
336 KALLSYMS = scripts/kallsyms
340 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
341 -Wbitwise -Wno-return-void $(CF)
347 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
350 # Use LINUXINCLUDE when you must reference the include/ directory.
351 # Needed to be compatible with the O= option
352 LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
353 $(if $(KBUILD_SRC), -I$(srctree)/include) \
354 -include include/generated/autoconf.h
356 KBUILD_CPPFLAGS := -D__KERNEL__
358 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
359 -fno-strict-aliasing -fno-common \
360 -Werror-implicit-function-declaration \
361 -Wno-format-security \
362 -fno-delete-null-pointer-checks
363 KBUILD_AFLAGS_KERNEL :=
364 KBUILD_CFLAGS_KERNEL :=
365 KBUILD_AFLAGS := -D__ASSEMBLY__
366 KBUILD_AFLAGS_MODULE := -DMODULE
367 KBUILD_CFLAGS_MODULE := -DMODULE
368 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
370 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
371 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
372 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
374 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
375 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
376 export CPP AR NM STRIP OBJCOPY OBJDUMP
377 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
378 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
380 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
381 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
382 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
383 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
384 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
385 export KBUILD_ARFLAGS
387 # When compiling out-of-tree modules, put MODVERDIR in the module
388 # tree rather than in the kernel tree. The kernel tree might
390 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
392 # Files to ignore in find ... statements
394 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
395 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
397 # ===========================================================================
398 # Rules shared between *config targets and build targets
400 # Basic helpers built in scripts/
401 PHONY += scripts_basic
403 $(Q)$(MAKE) $(build)=scripts/basic
404 $(Q)rm -f .tmp_quiet_recordmcount
406 # To avoid any implicit rule to kick in, define an empty command.
407 scripts/basic/%: scripts_basic ;
409 PHONY += outputmakefile
410 # outputmakefile generates a Makefile in the output directory, if using a
411 # separate output directory. This allows convenient use of make in the
414 ifneq ($(KBUILD_SRC),)
415 $(Q)ln -fsn $(srctree) source
416 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
417 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
420 # To make sure we do not include .config for any of the *config targets
421 # catch them early, and hand them over to scripts/kconfig/Makefile
422 # It is allowed to specify more targets when calling make, including
423 # mixing *config targets and build targets.
424 # For example 'make oldconfig all'.
425 # Detect when mixed targets is specified, and make a second invocation
426 # of make so .config is not included in this case either (for *config).
428 no-dot-config-targets := clean mrproper distclean \
429 cscope gtags TAGS tags help %docs check% coccicheck \
430 include/linux/version.h headers_% \
431 kernelversion %src-pkg
437 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
438 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
443 ifeq ($(KBUILD_EXTMOD),)
444 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
446 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
452 ifeq ($(mixed-targets),1)
453 # ===========================================================================
454 # We're called with mixed targets (*config and build targets).
455 # Handle them one by one.
458 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
461 ifeq ($(config-targets),1)
462 # ===========================================================================
463 # *config targets only - make sure prerequisites are updated, and descend
464 # in scripts/kconfig to make the *config target
466 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
467 # KBUILD_DEFCONFIG may point out an alternative default configuration
468 # used for 'make defconfig'
469 include $(srctree)/arch/$(SRCARCH)/Makefile
470 export KBUILD_DEFCONFIG KBUILD_KCONFIG
472 config: scripts_basic outputmakefile FORCE
473 $(Q)mkdir -p include/linux include/config
474 $(Q)$(MAKE) $(build)=scripts/kconfig $@
476 %config: scripts_basic outputmakefile FORCE
477 $(Q)mkdir -p include/linux include/config
478 $(Q)$(MAKE) $(build)=scripts/kconfig $@
481 # ===========================================================================
482 # Build targets only - this includes vmlinux, arch specific targets, clean
483 # targets and others. In general all targets except *config targets.
485 ifeq ($(KBUILD_EXTMOD),)
486 # Additional helpers built in scripts/
487 # Carefully list dependencies so we do not try to build scripts twice
490 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
491 $(Q)$(MAKE) $(build)=$(@)
493 # Objects we will link into vmlinux / subdirs we need to visit
495 drivers-y := drivers/ sound/ firmware/
499 endif # KBUILD_EXTMOD
501 ifeq ($(dot-config),1)
503 -include include/config/auto.conf
505 ifeq ($(KBUILD_EXTMOD),)
506 # Read in dependencies to all Kconfig* files, make sure to run
507 # oldconfig if changes are detected.
508 -include include/config/auto.conf.cmd
510 # To avoid any implicit rule to kick in, define an empty command
511 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
513 # If .config is newer than include/config/auto.conf, someone tinkered
514 # with it and forgot to run make oldconfig.
515 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
516 # we execute the config step to be sure to catch updated Kconfig files
517 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
518 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
520 # external modules needs include/generated/autoconf.h and include/config/auto.conf
521 # but do not care if they are up-to-date. Use auto.conf to trigger the test
522 PHONY += include/config/auto.conf
524 include/config/auto.conf:
525 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
527 echo " ERROR: Kernel configuration is invalid."; \
528 echo " include/generated/autoconf.h or $@ are missing.";\
529 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
533 endif # KBUILD_EXTMOD
536 # Dummy target needed, because used as prerequisite
537 include/config/auto.conf: ;
538 endif # $(dot-config)
540 # The all: target is the default when no target is given on the
542 # This allow a user to issue only 'make' to build a kernel including modules
543 # Defaults to vmlinux, but the arch makefile usually adds further targets
546 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
552 include $(srctree)/arch/$(SRCARCH)/Makefile
554 ifneq ($(CONFIG_FRAME_WARN),0)
555 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
558 # Force gcc to behave correct even for buggy distributions
559 ifndef CONFIG_CC_STACKPROTECTOR
560 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
563 ifdef CONFIG_FRAME_POINTER
564 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
566 # Some targets (ARM with Thumb2, for example), can't be built with frame
567 # pointers. For those, we don't have FUNCTION_TRACER automatically
568 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
569 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
570 # -fomit-frame-pointer with FUNCTION_TRACER.
571 ifndef CONFIG_FUNCTION_TRACER
572 KBUILD_CFLAGS += -fomit-frame-pointer
576 ifdef CONFIG_DEBUG_INFO
578 KBUILD_AFLAGS += -gdwarf-2
581 ifdef CONFIG_DEBUG_INFO_REDUCED
582 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
585 ifdef CONFIG_FUNCTION_TRACER
587 ifdef CONFIG_DYNAMIC_FTRACE
588 ifdef CONFIG_HAVE_C_RECORDMCOUNT
589 BUILD_C_RECORDMCOUNT := y
590 export BUILD_C_RECORDMCOUNT
595 # We trigger additional mismatches with less inlining
596 ifdef CONFIG_DEBUG_SECTION_MISMATCH
597 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
600 # arch Makefile may override CC so keep this after arch Makefile is included
601 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
602 CHECKFLAGS += $(NOSTDINC_FLAGS)
604 # warn about C99 declaration after statement
605 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
607 # disable pointer signed / unsigned warnings in gcc 4.0
608 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
610 # disable invalid "can't wrap" optimizations for signed / pointers
611 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
613 # conserve stack if available
614 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
616 # use the deterministic mode of AR if available
617 KBUILD_ARFLAGS := $(call ar-option,D)
619 # check for 'asm goto'
620 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
621 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
624 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
625 # But warn user when we do so
627 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
629 ifneq ($(KCPPFLAGS),)
630 $(call warn-assign,CPPFLAGS)
631 KBUILD_CPPFLAGS += $(KCPPFLAGS)
634 $(call warn-assign,AFLAGS)
635 KBUILD_AFLAGS += $(KAFLAGS)
638 $(call warn-assign,CFLAGS)
639 KBUILD_CFLAGS += $(KCFLAGS)
642 # Use --build-id when available.
643 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
644 $(call cc-ldoption, -Wl$(comma)--build-id,))
645 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
646 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
648 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
649 LDFLAGS_vmlinux += $(call ld-option, -X,)
652 # Default kernel image to build when no specific target is given.
653 # KBUILD_IMAGE may be overruled on the command line or
654 # set in the environment
655 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
657 export KBUILD_IMAGE ?= vmlinux
660 # INSTALL_PATH specifies where to place the updated kernel and system map
661 # images. Default is /boot, but you can set it to other values
662 export INSTALL_PATH ?= /boot
665 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
666 # relocations required by build roots. This is not defined in the
667 # makefile but the argument can be passed to make if needed.
670 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
674 # INSTALL_MOD_STRIP, if defined, will cause modules to be
675 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
676 # the default option --strip-debug will be used. Otherwise,
677 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
679 ifdef INSTALL_MOD_STRIP
680 ifeq ($(INSTALL_MOD_STRIP),1)
681 mod_strip_cmd = $(STRIP) --strip-debug
683 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
684 endif # INSTALL_MOD_STRIP=1
687 endif # INSTALL_MOD_STRIP
691 ifeq ($(KBUILD_EXTMOD),)
692 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
694 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
695 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
696 $(net-y) $(net-m) $(libs-y) $(libs-m)))
698 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
700 $(core-n) $(core-) $(drivers-n) $(drivers-) \
701 $(net-n) $(net-) $(libs-n) $(libs-))))
703 init-y := $(patsubst %/, %/built-in.o, $(init-y))
704 core-y := $(patsubst %/, %/built-in.o, $(core-y))
705 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
706 net-y := $(patsubst %/, %/built-in.o, $(net-y))
707 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
708 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
709 libs-y := $(libs-y1) $(libs-y2)
712 # ---------------------------------------------------------------------------
713 # vmlinux is built from the objects selected by $(vmlinux-init) and
714 # $(vmlinux-main). Most are built-in.o files from top-level directories
715 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
716 # Ordering when linking is important, and $(vmlinux-init) must be first.
721 # +-< $(vmlinux-init)
722 # | +--< init/version.o + more
724 # +--< $(vmlinux-main)
725 # | +--< driver/built-in.o mm/built-in.o + more
727 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
729 # vmlinux version (uname -v) cannot be updated during normal
730 # descending-into-subdirs phase since we do not yet know if we need to
732 # Therefore this step is delayed until just before final link of vmlinux -
733 # except in the kallsyms case where it is done just before adding the
734 # symbols to the kernel.
736 # System.map is generated to document addresses of all kernel symbols
738 vmlinux-init := $(head-y) $(init-y)
739 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
740 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
741 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
742 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
744 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
745 # May be overridden by arch/$(ARCH)/Makefile
746 quiet_cmd_vmlinux__ ?= LD $@
747 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
748 -T $(vmlinux-lds) $(vmlinux-init) \
749 --start-group $(vmlinux-main) --end-group \
750 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
752 # Generate new vmlinux version
753 quiet_cmd_vmlinux_version = GEN .version
754 cmd_vmlinux_version = set -e; \
755 if [ ! -r .version ]; then \
759 mv .version .old_version; \
760 expr 0$$(cat .old_version) + 1 >.version; \
762 $(MAKE) $(build)=init
764 # Generate System.map
765 quiet_cmd_sysmap = SYSMAP
766 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
769 # If CONFIG_KALLSYMS is set .version is already updated
770 # Generate System.map and verify that the content is consistent
771 # Use + in front of the vmlinux_version rule to silent warning with make -j2
772 # First command is ':' to allow us to use + in front of the rule
773 define rule_vmlinux__
775 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
777 $(call cmd,vmlinux__)
778 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
780 $(Q)$(if $($(quiet)cmd_sysmap), \
781 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
782 $(cmd_sysmap) $@ System.map; \
783 if [ $$? -ne 0 ]; then \
791 ifdef CONFIG_KALLSYMS
792 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
793 # It's a three stage process:
794 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
796 # Running kallsyms on that gives us .tmp_kallsyms1.o with
797 # the right size - vmlinux version (uname -v) is updated during this step
798 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
799 # but due to the added section, some addresses have shifted.
800 # From here, we generate a correct .tmp_kallsyms2.o
801 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
802 # o Verify that the System.map from vmlinux matches the map from
803 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
804 # o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
805 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
806 # temporary bypass to allow the kernel to be built while the
807 # maintainers work out what went wrong with kallsyms.
811 ifdef KALLSYMS_EXTRA_PASS
812 ifneq ($(KALLSYMS_EXTRA_PASS),0)
817 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
819 define verify_kallsyms
820 $(Q)$(if $($(quiet)cmd_sysmap), \
821 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
822 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
823 $(Q)cmp -s System.map .tmp_System.map || \
824 (echo Inconsistent kallsyms data; \
825 echo This is a bug - please report about it; \
826 echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround; \
827 rm .tmp_kallsyms* ; /bin/false )
830 # Update vmlinux version before link
831 # Use + in front of this rule to silent warning about make -j1
832 # First command is ':' to allow us to use + in front of this rule
833 cmd_ksym_ld = $(cmd_vmlinux__)
836 +$(call cmd,vmlinux_version)
837 $(call cmd,vmlinux__)
838 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
841 # Generate .S file with all kernel symbols
842 quiet_cmd_kallsyms = KSYM $@
843 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
844 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
846 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
847 $(call if_changed_dep,as_o_S)
849 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
852 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
853 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
854 $(call if_changed_rule,ksym_ld)
856 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
857 $(call if_changed,vmlinux__)
859 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
860 $(call if_changed,vmlinux__)
862 # Needs to visit scripts/ before $(KALLSYMS) can be used.
863 $(KALLSYMS): scripts ;
865 # Generate some data for debugging strange kallsyms problems
866 debug_kallsyms: .tmp_map$(last_kallsyms)
868 .tmp_map%: .tmp_vmlinux% FORCE
869 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
875 endif # ifdef CONFIG_KALLSYMS
877 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
878 # relevant sections renamed as per the linker script.
879 quiet_cmd_vmlinux-modpost = LD $@
880 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
881 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
882 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
883 define rule_vmlinux-modpost
885 +$(call cmd,vmlinux-modpost)
886 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
887 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
890 # vmlinux image - including updated kernel symbols
891 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
892 ifdef CONFIG_HEADERS_CHECK
893 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
896 $(Q)$(MAKE) $(build)=samples
898 ifdef CONFIG_BUILD_DOCSRC
899 $(Q)$(MAKE) $(build)=Documentation
901 $(call vmlinux-modpost)
902 $(call if_changed_rule,vmlinux__)
903 $(Q)rm -f .old_version
905 # build vmlinux.o first to catch section mismatch errors early
906 ifdef CONFIG_KALLSYMS
907 .tmp_vmlinux1: vmlinux.o
910 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
911 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
912 $(call if_changed_rule,vmlinux-modpost)
914 # The actual objects are generated when descending,
915 # make sure no implicit rule kicks in
916 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
918 # Handle descending into subdirectories listed in $(vmlinux-dirs)
919 # Preset locale variables to speed up the build process. Limit locale
920 # tweaks to this spot to avoid wrong language settings when running
921 # make menuconfig etc.
922 # Error messages still appears in the original language
924 PHONY += $(vmlinux-dirs)
925 $(vmlinux-dirs): prepare scripts
926 $(Q)$(MAKE) $(build)=$@
928 # Store (new) KERNELRELASE string in include/config/kernel.release
929 include/config/kernel.release: include/config/auto.conf FORCE
931 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
934 # Things we need to do before we recursively start building the kernel
935 # or the modules are listed in "prepare".
936 # A multi level approach is used. prepareN is processed before prepareN-1.
937 # archprepare is used in arch Makefiles and when processed asm symlink,
938 # version.h and scripts_basic is processed / created.
940 # Listed in dependency order
941 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
943 # prepare3 is used to check if we are building in a separate output directory,
945 # 1) Check that make has not been executed in the kernel src $(srctree)
946 prepare3: include/config/kernel.release
947 ifneq ($(KBUILD_SRC),)
948 @$(kecho) ' Using $(srctree) as source for kernel'
949 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
950 echo " $(srctree) is not clean, please run 'make mrproper'";\
951 echo " in the '$(srctree)' directory.";\
956 # prepare2 creates a makefile if using a separate output directory
957 prepare2: prepare3 outputmakefile
959 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
960 include/config/auto.conf
963 archprepare: prepare1 scripts_basic
965 prepare0: archprepare FORCE
966 $(Q)$(MAKE) $(build)=.
967 $(Q)$(MAKE) $(build)=. missing-syscalls
969 # All the preparing..
972 # Generate some files
973 # ---------------------------------------------------------------------------
975 # KERNELRELEASE can change from a few different places, meaning version.h
976 # needs to be updated, so this check is forced on all builds
979 define filechk_utsrelease.h
980 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
981 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
984 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
987 define filechk_version.h
988 (echo \#define LINUX_VERSION_CODE $(shell \
989 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
990 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
993 include/linux/version.h: $(srctree)/Makefile FORCE
994 $(call filechk,version.h)
996 include/generated/utsrelease.h: include/config/kernel.release FORCE
997 $(call filechk,utsrelease.h)
1001 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1003 # ---------------------------------------------------------------------------
1007 @echo '*** Warning: make $@ is unnecessary now.'
1009 # ---------------------------------------------------------------------------
1011 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1012 export INSTALL_FW_PATH
1014 PHONY += firmware_install
1015 firmware_install: FORCE
1016 @mkdir -p $(objtree)/firmware
1017 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1019 # ---------------------------------------------------------------------------
1022 #Default location for installed headers
1023 export INSTALL_HDR_PATH = $(objtree)/usr
1025 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1027 # If we do an all arch process set dst to asm-$(hdr-arch)
1028 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1031 __headers: include/linux/version.h scripts_basic FORCE
1032 $(Q)$(MAKE) $(build)=scripts build_unifdef
1034 PHONY += headers_install_all
1035 headers_install_all:
1036 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1038 PHONY += headers_install
1039 headers_install: __headers
1040 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1041 $(error Headers not exportable for the $(SRCARCH) architecture))
1042 $(Q)$(MAKE) $(hdr-inst)=include
1043 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1045 PHONY += headers_check_all
1046 headers_check_all: headers_install_all
1047 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1049 PHONY += headers_check
1050 headers_check: headers_install
1051 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1052 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1054 # ---------------------------------------------------------------------------
1057 ifdef CONFIG_MODULES
1059 # By default, build modules as well
1065 # A module can be listed more than once in obj-m resulting in
1066 # duplicate lines in modules.order files. Those are removed
1067 # using awk while concatenating to the final file.
1070 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1071 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1072 @$(kecho) ' Building modules, stage 2.';
1073 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1074 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1076 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1077 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1079 %/modules.builtin: include/config/auto.conf
1080 $(Q)$(MAKE) $(modbuiltin)=$*
1083 # Target to prepare building external modules
1084 PHONY += modules_prepare
1085 modules_prepare: prepare scripts
1087 # Target to install modules
1088 PHONY += modules_install
1089 modules_install: _modinst_ _modinst_post
1093 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1094 echo "Warning: you may need to install module-init-tools"; \
1095 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1098 @rm -rf $(MODLIB)/kernel
1099 @rm -f $(MODLIB)/source
1100 @mkdir -p $(MODLIB)/kernel
1101 @ln -s $(srctree) $(MODLIB)/source
1102 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1103 rm -f $(MODLIB)/build ; \
1104 ln -s $(objtree) $(MODLIB)/build ; \
1106 @cp -f $(objtree)/modules.order $(MODLIB)/
1107 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1108 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1110 # This depmod is only for convenience to give the initial
1111 # boot a modules.dep even before / is mounted read-write. However the
1112 # boot script depmod is the master version.
1113 PHONY += _modinst_post
1114 _modinst_post: _modinst_
1115 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1118 else # CONFIG_MODULES
1120 # Modules not configured
1121 # ---------------------------------------------------------------------------
1123 modules modules_install: FORCE
1125 @echo "The present kernel configuration has modules disabled."
1126 @echo "Type 'make config' and enable loadable module support."
1127 @echo "Then build a kernel with module support enabled."
1131 endif # CONFIG_MODULES
1134 # Cleaning is done on three levels.
1135 # make clean Delete most generated files
1136 # Leave enough to build external modules
1137 # make mrproper Delete the current configuration, and all generated files
1138 # make distclean Remove editor backup files, patch leftover files and the like
1140 # Directories & files removed with 'make clean'
1141 CLEAN_DIRS += $(MODVERDIR)
1142 CLEAN_FILES += vmlinux System.map \
1143 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1145 # Directories & files removed with 'make mrproper'
1146 MRPROPER_DIRS += include/config usr/include include/generated
1147 MRPROPER_FILES += .config .config.old .version .old_version \
1148 include/linux/version.h \
1149 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1151 # clean - Delete most, but leave enough to build external modules
1153 clean: rm-dirs := $(CLEAN_DIRS)
1154 clean: rm-files := $(CLEAN_FILES)
1155 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1157 PHONY += $(clean-dirs) clean archclean
1159 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1163 # mrproper - Delete all generated files, including .config
1165 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1166 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1167 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1169 PHONY += $(mrproper-dirs) mrproper archmrproper
1171 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1173 mrproper: clean archmrproper $(mrproper-dirs)
1182 @find $(srctree) $(RCS_FIND_IGNORE) \
1183 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1184 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1185 -o -name '.*.rej' -o -size 0 \
1186 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1187 -type f -print | xargs rm -f
1190 # Packaging of the kernel to various formats
1191 # ---------------------------------------------------------------------------
1192 # rpm target kept for backward compatibility
1193 package-dir := $(srctree)/scripts/package
1196 $(Q)$(MAKE) $(build)=$(package-dir) $@
1197 %pkg: include/config/kernel.release FORCE
1198 $(Q)$(MAKE) $(build)=$(package-dir) $@
1199 rpm: include/config/kernel.release FORCE
1200 $(Q)$(MAKE) $(build)=$(package-dir) $@
1203 # Brief documentation of the typical targets used
1204 # ---------------------------------------------------------------------------
1206 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1207 boards := $(notdir $(boards))
1208 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1209 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1212 @echo 'Cleaning targets:'
1213 @echo ' clean - Remove most generated files but keep the config and'
1214 @echo ' enough build support to build external modules'
1215 @echo ' mrproper - Remove all generated files + config + various backup files'
1216 @echo ' distclean - mrproper + remove editor backup and patch files'
1218 @echo 'Configuration targets:'
1219 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1221 @echo 'Other generic targets:'
1222 @echo ' all - Build all targets marked with [*]'
1223 @echo '* vmlinux - Build the bare kernel'
1224 @echo '* modules - Build all modules'
1225 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1226 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1227 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1228 @echo ' dir/ - Build all files in dir and below'
1229 @echo ' dir/file.[oisS] - Build specified target only'
1230 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1231 @echo ' (requires a recent binutils and recent build (System.map))'
1232 @echo ' dir/file.ko - Build module including final link'
1233 @echo ' modules_prepare - Set up for building external modules'
1234 @echo ' tags/TAGS - Generate tags file for editors'
1235 @echo ' cscope - Generate cscope index'
1236 @echo ' gtags - Generate GNU GLOBAL index'
1237 @echo ' kernelrelease - Output the release version string'
1238 @echo ' kernelversion - Output the version stored in Makefile'
1239 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1240 echo ' (default: $(INSTALL_HDR_PATH))'; \
1242 @echo 'Static analysers'
1243 @echo ' checkstack - Generate a list of stack hogs'
1244 @echo ' namespacecheck - Name space analysis on compiled kernel'
1245 @echo ' versioncheck - Sanity check on version.h usage'
1246 @echo ' includecheck - Check for duplicate included header files'
1247 @echo ' export_report - List the usages of all exported symbols'
1248 @echo ' headers_check - Sanity check on exported headers'
1249 @echo ' headerdep - Detect inclusion cycles in headers'
1250 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1252 @echo 'Kernel packaging:'
1253 @$(MAKE) $(build)=$(package-dir) help
1255 @echo 'Documentation targets:'
1256 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1258 @echo 'Architecture specific targets ($(SRCARCH)):'
1259 @$(if $(archhelp),$(archhelp),\
1260 echo ' No architecture specific help defined for $(SRCARCH)')
1263 $(foreach b, $(boards), \
1264 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1266 @$(if $(board-dirs), \
1267 $(foreach b, $(board-dirs), \
1268 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1269 printf " %-16s - Show all of the above\\n" help-boards; \
1272 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1273 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1274 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1275 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1276 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1277 @echo ' make W=1 [targets] Enable extra gcc checks'
1279 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1280 @echo 'For further info see the ./README file'
1283 help-board-dirs := $(addprefix help-,$(board-dirs))
1285 help-boards: $(help-board-dirs)
1287 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1289 $(help-board-dirs): help-%:
1290 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1291 @$(if $(boards-per-dir), \
1292 $(foreach b, $(boards-per-dir), \
1293 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1297 # Documentation targets
1298 # ---------------------------------------------------------------------------
1299 %docs: scripts_basic FORCE
1300 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1302 else # KBUILD_EXTMOD
1305 # External module support.
1306 # When building external modules the kernel used as basis is considered
1307 # read-only, and no consistency checks are made and the make
1308 # system is not used on the basis kernel. If updates are required
1309 # in the basis kernel ordinary make commands (without M=...) must
1312 # The following are the only valid targets when building external
1314 # make M=dir clean Delete all automatically generated files
1315 # make M=dir modules Make all modules in specified dir
1316 # make M=dir Same as 'make M=dir modules'
1317 # make M=dir modules_install
1318 # Install the modules built in the module directory
1319 # Assumes install directory is already created
1321 # We are always building modules
1323 PHONY += crmodverdir
1327 PHONY += $(objtree)/Module.symvers
1328 $(objtree)/Module.symvers:
1329 @test -e $(objtree)/Module.symvers || ( \
1331 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1332 echo " is missing; modules will have no dependencies and modversions."; \
1335 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1336 PHONY += $(module-dirs) modules
1337 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1338 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1340 modules: $(module-dirs)
1341 @$(kecho) ' Building modules, stage 2.';
1342 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1344 PHONY += modules_install
1345 modules_install: _emodinst_ _emodinst_post
1347 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1350 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1351 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1353 PHONY += _emodinst_post
1354 _emodinst_post: _emodinst_
1357 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1359 PHONY += $(clean-dirs) clean
1361 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1363 clean: rm-dirs := $(MODVERDIR)
1364 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1367 @echo ' Building external modules.'
1368 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1370 @echo ' modules - default target, build the module(s)'
1371 @echo ' modules_install - install the module'
1372 @echo ' clean - remove generated files in module directory only'
1376 PHONY += prepare scripts
1379 endif # KBUILD_EXTMOD
1381 clean: $(clean-dirs)
1384 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1385 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1386 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1387 -o -name '*.symtypes' -o -name 'modules.order' \
1388 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1389 -o -name '*.gcno' \) -type f -print | xargs rm -f
1391 # Generate tags for editors
1392 # ---------------------------------------------------------------------------
1393 quiet_cmd_tags = GEN $@
1394 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1396 tags TAGS cscope gtags: FORCE
1399 # Scripts to check various things for consistency
1400 # ---------------------------------------------------------------------------
1403 find * $(RCS_FIND_IGNORE) \
1404 -name '*.[hcS]' -type f -print | sort \
1405 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1408 find * $(RCS_FIND_IGNORE) \
1409 -name '*.[hcS]' -type f -print | sort \
1410 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1413 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1416 $(PERL) $(srctree)/scripts/namespace.pl
1419 $(PERL) $(srctree)/scripts/export_report.pl
1421 endif #ifeq ($(config-targets),1)
1422 endif #ifeq ($(mixed-targets),1)
1424 PHONY += checkstack kernelrelease kernelversion
1426 # UML needs a little special treatment here. It wants to use the host
1427 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1428 # else wants $(ARCH), including people doing cross-builds, which means
1429 # that $(SUBARCH) doesn't work here.
1431 CHECKSTACK_ARCH := $(SUBARCH)
1433 CHECKSTACK_ARCH := $(ARCH)
1436 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1437 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1440 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1443 @echo $(KERNELVERSION)
1446 # ---------------------------------------------------------------------------
1447 # Single targets are compatible with:
1448 # - build with mixed source and output
1449 # - build with separate output dir 'make O=...'
1450 # - external modules
1452 # target-dir => where to store outputfile
1453 # build-dir => directory in kernel source tree to use
1455 ifeq ($(KBUILD_EXTMOD),)
1456 build-dir = $(patsubst %/,%,$(dir $@))
1457 target-dir = $(dir $@)
1459 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1460 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1461 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1464 %.s: %.c prepare scripts FORCE
1465 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1466 %.i: %.c prepare scripts FORCE
1467 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1468 %.o: %.c prepare scripts FORCE
1469 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1470 %.lst: %.c prepare scripts FORCE
1471 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1472 %.s: %.S prepare scripts FORCE
1473 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1474 %.o: %.S prepare scripts FORCE
1475 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1476 %.symtypes: %.c prepare scripts FORCE
1477 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1480 /: prepare scripts FORCE
1482 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1483 $(build)=$(build-dir)
1484 %/: prepare scripts FORCE
1486 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1487 $(build)=$(build-dir)
1488 %.ko: prepare scripts FORCE
1490 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1491 $(build)=$(build-dir) $(@:.ko=.o)
1492 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1494 # FIXME Should go into a make.lib or something
1495 # ===========================================================================
1497 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1498 cmd_rmdirs = rm -rf $(rm-dirs)
1500 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1501 cmd_rmfiles = rm -f $(rm-files)
1503 # Run depmod only if we have System.map and depmod is executable
1504 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1506 if [ -r System.map -a -x $(DEPMOD) ]; then \
1507 $(DEPMOD) -ae -F System.map \
1508 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1512 # Create temporary dir for module support files
1513 # clean it up only when building all modules
1514 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1515 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1517 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1518 $(KBUILD_AFLAGS_KERNEL) \
1519 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1520 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1522 quiet_cmd_as_o_S = AS $@
1523 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1525 # read all saved command lines
1527 targets := $(wildcard $(sort $(targets)))
1528 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1530 ifneq ($(cmd_files),)
1531 $(cmd_files): ; # Do not try to update included dependency files
1532 include $(cmd_files)
1535 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1537 # $(Q)$(MAKE) $(clean)=dir
1538 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1540 endif # skip-makefile
1545 # Declare the contents of the .PHONY variable as phony. We keep that
1546 # information in a variable so we can use it in if_changed and friends.