5 NAME = Saber-toothed Squirrel
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 = $(C)
64 ifndef KBUILD_CHECKSRC
68 # Call message checker as part of the C compilation
70 # Use 'make D=1' to enable checking
71 # Use 'make D=2' to create the message catalog
74 ifeq ("$(origin D)", "command line")
75 KBUILD_KMSG_CHECK = $(D)
78 ifndef KBUILD_KMSG_CHECK
82 # Use make M=dir to specify directory of external module to build
83 # Old syntax make ... SUBDIRS=$PWD is still supported
84 # Setting the environment variable KBUILD_EXTMOD take precedence
86 KBUILD_EXTMOD ?= $(SUBDIRS)
89 ifeq ("$(origin M)", "command line")
93 # kbuild supports saving output files in a separate directory.
94 # To locate output files in a separate directory two syntaxes are supported.
95 # In both cases the working directory must be the root of the kernel src.
97 # Use "make O=dir/to/store/output/files/"
99 # 2) Set KBUILD_OUTPUT
100 # Set the environment variable KBUILD_OUTPUT to point to the directory
101 # where the output files shall be placed.
102 # export KBUILD_OUTPUT=dir/to/store/output/files/
105 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
109 # KBUILD_SRC is set on invocation of make in OBJ directory
110 # KBUILD_SRC is not intended to be used by the regular user (for now)
111 ifeq ($(KBUILD_SRC),)
113 # OK, Make called in directory where kernel src resides
114 # Do we want to locate output files in a separate directory?
115 ifeq ("$(origin O)", "command line")
116 KBUILD_OUTPUT := $(O)
119 ifeq ("$(origin W)", "command line")
120 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
123 # That's our default target when none is given on the command line
127 # Cancel implicit rules on top Makefile
128 $(CURDIR)/Makefile Makefile: ;
130 ifneq ($(KBUILD_OUTPUT),)
131 # Invoke a second make in the output directory, passing relevant variables
132 # check that the output directory actually exists
133 saved-output := $(KBUILD_OUTPUT)
134 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
135 $(if $(KBUILD_OUTPUT),, \
136 $(error output directory "$(saved-output)" does not exist))
138 PHONY += $(MAKECMDGOALS) sub-make
140 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
144 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
145 KBUILD_SRC=$(CURDIR) \
146 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
147 $(filter-out _all sub-make,$(MAKECMDGOALS))
149 # Leave processing to above invocation of make
151 endif # ifneq ($(KBUILD_OUTPUT),)
152 endif # ifeq ($(KBUILD_SRC),)
154 # We process the rest of the Makefile if this is the final invocation of make
155 ifeq ($(skip-makefile),)
157 # If building an external module we do not care about the all: rule
158 # but instead _all depend on modules
160 ifeq ($(KBUILD_EXTMOD),)
166 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
171 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
173 export srctree objtree VPATH
176 # SUBARCH tells the usermode build what the underlying arch is. That is set
177 # first, and if a usermode build is happening, the "ARCH=um" on the command
178 # line overrides the setting of ARCH below. If a native build is happening,
179 # then ARCH is assigned, getting whatever value it gets normally, and
180 # SUBARCH is subsequently ignored.
182 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
183 -e s/arm.*/arm/ -e s/sa110/arm/ \
184 -e s/s390x/s390/ -e s/parisc64/parisc/ \
185 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
188 # Cross compiling and selecting different set of gcc/bin-utils
189 # ---------------------------------------------------------------------------
191 # When performing cross compilation for other architectures ARCH shall be set
192 # to the target architecture. (See arch/* for the possibilities).
193 # ARCH can be set during invocation of make:
195 # Another way is to have ARCH set in the environment.
196 # The default ARCH is the host where make is executed.
198 # CROSS_COMPILE specify the prefix used for all executables used
199 # during compilation. Only gcc and related bin-utils executables
200 # are prefixed with $(CROSS_COMPILE).
201 # CROSS_COMPILE can be set on the command line
202 # make CROSS_COMPILE=ia64-linux-
203 # Alternatively CROSS_COMPILE can be set in the environment.
204 # A third alternative is to store a setting in .config so that plain
205 # "make" in the configured kernel build directory always uses that.
206 # Default value for CROSS_COMPILE is not to prefix executables
207 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
208 export KBUILD_BUILDHOST := $(SUBARCH)
210 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
212 # Architecture as present in compile.h
213 UTS_MACHINE := $(ARCH)
216 # Additional ARCH settings for x86
220 ifeq ($(ARCH),x86_64)
224 # Additional ARCH settings for sparc
225 ifeq ($(ARCH),sparc32)
228 ifeq ($(ARCH),sparc64)
232 # Additional ARCH settings for sh
237 # Additional ARCH settings for tile
238 ifeq ($(ARCH),tilepro)
241 ifeq ($(ARCH),tilegx)
245 # Where to locate arch specific headers
246 hdr-arch := $(SRCARCH)
248 ifeq ($(ARCH),m68knommu)
252 KCONFIG_CONFIG ?= .config
253 export KCONFIG_CONFIG
255 # SHELL used by kbuild
256 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
257 else if [ -x /bin/bash ]; then echo /bin/bash; \
258 else echo sh; fi ; fi)
262 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
265 # Decide whether to build built-in, modular, or both.
266 # Normally, just do built-in.
271 # If we have only "make modules", don't compile built-in objects.
272 # When we're building modules with modversions, we need to consider
273 # the built-in objects during the descend as well, in order to
274 # make sure the checksums are up to date before we record them.
276 ifeq ($(MAKECMDGOALS),modules)
277 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
280 # If we have "make <whatever> modules", compile modules
281 # in addition to whatever we do anyway.
282 # Just "make" or "make all" shall build modules as well
284 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
288 ifeq ($(MAKECMDGOALS),)
292 export KBUILD_MODULES KBUILD_BUILTIN
293 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
296 # ---------------------------------------------------------------------------
298 # Normally, we echo the whole command before executing it. By making
299 # that echo $($(quiet)$(cmd)), we now have the possibility to set
300 # $(quiet) to choose other forms of output instead, e.g.
302 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
303 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
305 # If $(quiet) is empty, the whole command will be printed.
306 # If it is set to "quiet_", only the short version will be printed.
307 # If it is set to "silent_", nothing will be printed at all, since
308 # the variable $(silent_cmd_cc_o_c) doesn't exist.
310 # A simple variant is to prefix commands with $(Q) - that's useful
311 # for commands that shall be hidden in non-verbose mode.
315 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
316 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
318 ifeq ($(KBUILD_VERBOSE),1)
326 # If the user is running make -s (silent mode), suppress echoing of
329 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
333 export quiet Q KBUILD_VERBOSE
336 # Look for make include files relative to root of kernel src
337 MAKEFLAGS += --include-dir=$(srctree)
339 # We need some generic definitions (do not try to remake the file).
340 $(srctree)/scripts/Kbuild.include: ;
341 include $(srctree)/scripts/Kbuild.include
343 # Make variables (CC, etc...)
345 AS = $(CROSS_COMPILE)as
346 LD = $(CROSS_COMPILE)ld
347 CC = $(CROSS_COMPILE)gcc
349 AR = $(CROSS_COMPILE)ar
350 NM = $(CROSS_COMPILE)nm
351 STRIP = $(CROSS_COMPILE)strip
352 OBJCOPY = $(CROSS_COMPILE)objcopy
353 OBJDUMP = $(CROSS_COMPILE)objdump
355 GENKSYMS = scripts/genksyms/genksyms
356 INSTALLKERNEL := installkernel
357 DEPMOD = /sbin/depmod
358 KALLSYMS = scripts/kallsyms
362 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
363 -Wbitwise -Wno-return-void $(CF)
364 KMSG_CHECK = $(srctree)/scripts/kmsg-doc
370 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
373 # Use LINUXINCLUDE when you must reference the include/ directory.
374 # Needed to be compatible with the O= option
375 LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include \
376 -Iarch/$(hdr-arch)/include/generated -Iinclude \
377 $(if $(KBUILD_SRC), -I$(srctree)/include) \
378 -include $(srctree)/include/linux/kconfig.h
380 KBUILD_CPPFLAGS := -D__KERNEL__
382 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
383 -fno-strict-aliasing -fno-common \
384 -Werror-implicit-function-declaration \
385 -Wno-format-security \
386 -fno-delete-null-pointer-checks
387 KBUILD_AFLAGS_KERNEL :=
388 KBUILD_CFLAGS_KERNEL :=
389 KBUILD_AFLAGS := -D__ASSEMBLY__
390 KBUILD_AFLAGS_MODULE := -DMODULE
391 KBUILD_CFLAGS_MODULE := -DMODULE
392 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
394 # Warn about unsupported modules in kernels built inside Autobuild
395 ifneq ($(wildcard /.buildenv),)
396 CFLAGS += -DUNSUPPORTED_MODULES=2
399 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
400 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
401 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
403 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
404 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
405 export CPP AR NM STRIP OBJCOPY OBJDUMP
406 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
407 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
409 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
410 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
411 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
412 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
413 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
414 export KBUILD_ARFLAGS
415 export KBUILD_KMSG_CHECK KMSG_CHECK
417 # When compiling out-of-tree modules, put MODVERDIR in the module
418 # tree rather than in the kernel tree. The kernel tree might
420 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
422 # Files to ignore in find ... statements
424 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
425 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
427 # ===========================================================================
428 # Rules shared between *config targets and build targets
430 # Basic helpers built in scripts/
431 PHONY += scripts_basic
433 $(Q)$(MAKE) $(build)=scripts/basic
434 $(Q)rm -f .tmp_quiet_recordmcount
436 # To avoid any implicit rule to kick in, define an empty command.
437 scripts/basic/%: scripts_basic ;
439 PHONY += outputmakefile
440 # outputmakefile generates a Makefile in the output directory, if using a
441 # separate output directory. This allows convenient use of make in the
444 ifneq ($(KBUILD_SRC),)
445 $(Q)ln -fsn $(srctree) source
446 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
447 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
450 # Support for using generic headers in asm-generic
453 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
454 obj=arch/$(SRCARCH)/include/generated/asm
456 # To make sure we do not include .config for any of the *config targets
457 # catch them early, and hand them over to scripts/kconfig/Makefile
458 # It is allowed to specify more targets when calling make, including
459 # mixing *config targets and build targets.
460 # For example 'make oldconfig all'.
461 # Detect when mixed targets is specified, and make a second invocation
462 # of make so .config is not included in this case either (for *config).
464 no-dot-config-targets := clean mrproper distclean \
465 cscope gtags TAGS tags help %docs check% coccicheck \
466 include/linux/version.h headers_% archheaders \
467 kernelversion %src-pkg
473 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
474 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
479 ifeq ($(KBUILD_EXTMOD),)
480 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
482 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
488 ifeq ($(mixed-targets),1)
489 # ===========================================================================
490 # We're called with mixed targets (*config and build targets).
491 # Handle them one by one.
494 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
497 ifeq ($(config-targets),1)
498 # ===========================================================================
499 # *config targets only - make sure prerequisites are updated, and descend
500 # in scripts/kconfig to make the *config target
502 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
503 # KBUILD_DEFCONFIG may point out an alternative default configuration
504 # used for 'make defconfig'
505 include $(srctree)/arch/$(SRCARCH)/Makefile
506 export KBUILD_DEFCONFIG KBUILD_KCONFIG
508 config: scripts_basic outputmakefile FORCE
509 $(Q)mkdir -p include/linux include/config
510 $(Q)$(MAKE) $(build)=scripts/kconfig $@
512 %config: scripts_basic outputmakefile FORCE
513 $(Q)mkdir -p include/linux include/config
514 $(Q)$(MAKE) $(build)=scripts/kconfig $@
517 # ===========================================================================
518 # Build targets only - this includes vmlinux, arch specific targets, clean
519 # targets and others. In general all targets except *config targets.
521 ifeq ($(KBUILD_EXTMOD),)
522 # Additional helpers built in scripts/
523 # Carefully list dependencies so we do not try to build scripts twice
526 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
527 $(Q)$(MAKE) $(build)=$(@)
529 # Objects we will link into vmlinux / subdirs we need to visit
531 drivers-y := drivers/ sound/ firmware/
535 endif # KBUILD_EXTMOD
537 ifeq ($(dot-config),1)
539 -include include/config/auto.conf
541 ifeq ($(KBUILD_EXTMOD),)
542 # Read in dependencies to all Kconfig* files, make sure to run
543 # oldconfig if changes are detected.
544 -include include/config/auto.conf.cmd
546 # To avoid any implicit rule to kick in, define an empty command
547 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
549 # If .config is newer than include/config/auto.conf, someone tinkered
550 # with it and forgot to run make oldconfig.
551 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
552 # we execute the config step to be sure to catch updated Kconfig files
553 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
554 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
556 # external modules needs include/generated/autoconf.h and include/config/auto.conf
557 # but do not care if they are up-to-date. Use auto.conf to trigger the test
558 PHONY += include/config/auto.conf
560 include/config/auto.conf:
561 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
563 echo " ERROR: Kernel configuration is invalid."; \
564 echo " include/generated/autoconf.h or $@ are missing.";\
565 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
569 endif # KBUILD_EXTMOD
572 # Dummy target needed, because used as prerequisite
573 include/config/auto.conf: ;
574 endif # $(dot-config)
576 # The all: target is the default when no target is given on the
578 # This allow a user to issue only 'make' to build a kernel including modules
579 # Defaults to vmlinux, but the arch makefile usually adds further targets
582 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
588 include $(srctree)/arch/$(SRCARCH)/Makefile
590 ifneq ($(CONFIG_FRAME_WARN),0)
591 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
594 # Force gcc to behave correct even for buggy distributions
595 ifndef CONFIG_CC_STACKPROTECTOR
596 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
599 # This warning generated too much noise in a regular build.
600 # Use make W=1 to enable this warning (see scripts/Makefile.build)
601 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
603 ifdef CONFIG_FRAME_POINTER
604 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
606 # Some targets (ARM with Thumb2, for example), can't be built with frame
607 # pointers. For those, we don't have FUNCTION_TRACER automatically
608 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
609 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
610 # -fomit-frame-pointer with FUNCTION_TRACER.
611 ifndef CONFIG_FUNCTION_TRACER
612 KBUILD_CFLAGS += -fomit-frame-pointer
616 ifdef CONFIG_UNWIND_INFO
617 KBUILD_CFLAGS += -fasynchronous-unwind-tables
618 LDFLAGS_vmlinux += --eh-frame-hdr
621 ifdef CONFIG_DEBUG_INFO
623 KBUILD_AFLAGS += -gdwarf-2
626 ifdef CONFIG_DEBUG_INFO_REDUCED
627 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
630 ifdef CONFIG_FUNCTION_TRACER
632 ifdef CONFIG_DYNAMIC_FTRACE
633 ifdef CONFIG_HAVE_C_RECORDMCOUNT
634 BUILD_C_RECORDMCOUNT := y
635 export BUILD_C_RECORDMCOUNT
640 # We trigger additional mismatches with less inlining
641 ifdef CONFIG_DEBUG_SECTION_MISMATCH
642 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
645 # arch Makefile may override CC so keep this after arch Makefile is included
646 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
647 CHECKFLAGS += $(NOSTDINC_FLAGS)
649 # warn about C99 declaration after statement
650 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
652 # disable pointer signed / unsigned warnings in gcc 4.0
653 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
655 # disable invalid "can't wrap" optimizations for signed / pointers
656 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
658 # conserve stack if available
659 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
661 # use the deterministic mode of AR if available
662 KBUILD_ARFLAGS := $(call ar-option,D)
664 # check for 'asm goto'
665 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
666 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
669 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
670 # But warn user when we do so
672 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
674 ifneq ($(KCPPFLAGS),)
675 $(call warn-assign,CPPFLAGS)
676 KBUILD_CPPFLAGS += $(KCPPFLAGS)
679 $(call warn-assign,AFLAGS)
680 KBUILD_AFLAGS += $(KAFLAGS)
683 $(call warn-assign,CFLAGS)
684 KBUILD_CFLAGS += $(KCFLAGS)
687 # Use --build-id when available.
688 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
689 $(call cc-ldoption, -Wl$(comma)--build-id,))
690 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
691 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
693 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
694 LDFLAGS_vmlinux += $(call ld-option, -X,)
697 # Default kernel image to build when no specific target is given.
698 # KBUILD_IMAGE may be overruled on the command line or
699 # set in the environment
700 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
702 export KBUILD_IMAGE ?= vmlinux
705 # INSTALL_PATH specifies where to place the updated kernel and system map
706 # images. Default is /boot, but you can set it to other values
707 export INSTALL_PATH ?= /boot
710 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
711 # relocations required by build roots. This is not defined in the
712 # makefile but the argument can be passed to make if needed.
715 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
719 # INSTALL_MOD_STRIP, if defined, will cause modules to be
720 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
721 # the default option --strip-debug will be used. Otherwise,
722 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
724 ifdef INSTALL_MOD_STRIP
725 ifeq ($(INSTALL_MOD_STRIP),1)
726 mod_strip_cmd = $(STRIP) --strip-debug
728 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
729 endif # INSTALL_MOD_STRIP=1
732 endif # INSTALL_MOD_STRIP
736 ifeq ($(KBUILD_EXTMOD),)
737 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
739 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
740 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
741 $(net-y) $(net-m) $(libs-y) $(libs-m)))
743 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
745 $(core-n) $(core-) $(drivers-n) $(drivers-) \
746 $(net-n) $(net-) $(libs-n) $(libs-))))
748 init-y := $(patsubst %/, %/built-in.o, $(init-y))
749 core-y := $(patsubst %/, %/built-in.o, $(core-y))
750 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
751 net-y := $(patsubst %/, %/built-in.o, $(net-y))
752 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
753 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
754 libs-y := $(libs-y1) $(libs-y2)
757 # ---------------------------------------------------------------------------
758 # vmlinux is built from the objects selected by $(vmlinux-init) and
759 # $(vmlinux-main). Most are built-in.o files from top-level directories
760 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
761 # Ordering when linking is important, and $(vmlinux-init) must be first.
766 # +-< $(vmlinux-init)
767 # | +--< init/version.o + more
769 # +--< $(vmlinux-main)
770 # | +--< driver/built-in.o mm/built-in.o + more
772 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
774 # vmlinux version (uname -v) cannot be updated during normal
775 # descending-into-subdirs phase since we do not yet know if we need to
777 # Therefore this step is delayed until just before final link of vmlinux -
778 # except in the kallsyms case where it is done just before adding the
779 # symbols to the kernel.
781 # System.map is generated to document addresses of all kernel symbols
783 vmlinux-init := $(head-y) $(init-y)
784 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
785 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
786 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
787 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
789 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
790 # May be overridden by arch/$(ARCH)/Makefile
791 quiet_cmd_vmlinux__ ?= LD $@
792 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
793 -T $(vmlinux-lds) $(vmlinux-init) \
794 --start-group $(vmlinux-main) --end-group \
795 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
797 # Generate new vmlinux version
798 quiet_cmd_vmlinux_version = GEN .version
799 cmd_vmlinux_version = set -e; \
800 if [ ! -r .version ]; then \
804 mv .version .old_version; \
805 expr 0$$(cat .old_version) + 1 >.version; \
807 $(MAKE) $(build)=init
809 # Generate System.map
810 quiet_cmd_sysmap = SYSMAP
811 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
814 # If CONFIG_KALLSYMS is set .version is already updated
815 # Generate System.map and verify that the content is consistent
816 # Use + in front of the vmlinux_version rule to silent warning with make -j2
817 # First command is ':' to allow us to use + in front of the rule
818 define rule_vmlinux__
820 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
822 $(call cmd,vmlinux__)
823 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
825 $(Q)$(if $($(quiet)cmd_sysmap), \
826 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
827 $(cmd_sysmap) $@ System.map; \
828 if [ $$? -ne 0 ]; then \
836 ifdef CONFIG_KALLSYMS
837 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
838 # It's a three stage process:
839 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
841 # Running kallsyms on that gives us .tmp_kallsyms1.o with
842 # the right size - vmlinux version (uname -v) is updated during this step
843 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
844 # but due to the added section, some addresses have shifted.
845 # From here, we generate a correct .tmp_kallsyms2.o
846 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
847 # o Verify that the System.map from vmlinux matches the map from
848 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
849 # o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
850 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
851 # temporary bypass to allow the kernel to be built while the
852 # maintainers work out what went wrong with kallsyms.
856 ifdef KALLSYMS_EXTRA_PASS
857 ifneq ($(KALLSYMS_EXTRA_PASS),0)
862 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
864 define verify_kallsyms
865 $(Q)$(if $($(quiet)cmd_sysmap), \
866 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
867 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
868 $(Q)cmp -s System.map .tmp_System.map || \
869 (echo Inconsistent kallsyms data; \
870 echo This is a bug - please report about it; \
871 echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround; \
872 rm .tmp_kallsyms* ; /bin/false )
875 # Update vmlinux version before link
876 # Use + in front of this rule to silent warning about make -j1
877 # First command is ':' to allow us to use + in front of this rule
878 cmd_ksym_ld = $(cmd_vmlinux__)
881 +$(call cmd,vmlinux_version)
882 $(call cmd,vmlinux__)
883 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
886 # Generate .S file with all kernel symbols
887 quiet_cmd_kallsyms = KSYM $@
888 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
889 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
891 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
892 $(call if_changed_dep,as_o_S)
894 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
897 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
898 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
899 $(call if_changed_rule,ksym_ld)
901 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
902 $(call if_changed,vmlinux__)
904 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
905 $(call if_changed,vmlinux__)
907 # Needs to visit scripts/ before $(KALLSYMS) can be used.
908 $(KALLSYMS): scripts ;
910 # Generate some data for debugging strange kallsyms problems
911 debug_kallsyms: .tmp_map$(last_kallsyms)
913 .tmp_map%: .tmp_vmlinux% FORCE
914 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
920 endif # ifdef CONFIG_KALLSYMS
922 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
923 # relevant sections renamed as per the linker script.
924 quiet_cmd_vmlinux-modpost = LD $@
925 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
926 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
927 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
928 define rule_vmlinux-modpost
930 +$(call cmd,vmlinux-modpost)
931 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
932 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
935 # vmlinux image - including updated kernel symbols
936 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
937 ifdef CONFIG_HEADERS_CHECK
938 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
941 $(Q)$(MAKE) $(build)=samples
943 ifdef CONFIG_BUILD_DOCSRC
944 $(Q)$(MAKE) $(build)=Documentation
946 $(call vmlinux-modpost)
947 $(call if_changed_rule,vmlinux__)
948 $(Q)rm -f .old_version
950 # build vmlinux.o first to catch section mismatch errors early
951 ifdef CONFIG_KALLSYMS
952 .tmp_vmlinux1: vmlinux.o
955 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
956 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
957 $(call if_changed_rule,vmlinux-modpost)
959 # The actual objects are generated when descending,
960 # make sure no implicit rule kicks in
961 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
963 # Handle descending into subdirectories listed in $(vmlinux-dirs)
964 # Preset locale variables to speed up the build process. Limit locale
965 # tweaks to this spot to avoid wrong language settings when running
966 # make menuconfig etc.
967 # Error messages still appears in the original language
969 PHONY += $(vmlinux-dirs)
970 $(vmlinux-dirs): prepare scripts
971 $(Q)$(MAKE) $(build)=$@
973 # Store (new) KERNELRELASE string in include/config/kernel.release
974 include/config/kernel.release: include/config/auto.conf FORCE
976 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
979 # Things we need to do before we recursively start building the kernel
980 # or the modules are listed in "prepare".
981 # A multi level approach is used. prepareN is processed before prepareN-1.
982 # archprepare is used in arch Makefiles and when processed asm symlink,
983 # version.h and scripts_basic is processed / created.
985 # Listed in dependency order
986 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
988 # prepare3 is used to check if we are building in a separate output directory,
990 # 1) Check that make has not been executed in the kernel src $(srctree)
991 prepare3: include/config/kernel.release
992 ifneq ($(KBUILD_SRC),)
993 @$(kecho) ' Using $(srctree) as source for kernel'
994 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
995 echo " $(srctree) is not clean, please run 'make mrproper'";\
996 echo " in the '$(srctree)' directory.";\
1001 # prepare2 creates a makefile if using a separate output directory
1002 prepare2: prepare3 outputmakefile asm-generic
1004 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
1005 include/config/auto.conf
1008 archprepare: archheaders prepare1 scripts_basic
1010 prepare0: archprepare FORCE
1011 $(Q)$(MAKE) $(build)=.
1013 # All the preparing..
1016 # Generate some files
1017 # ---------------------------------------------------------------------------
1019 # KERNELRELEASE can change from a few different places, meaning version.h
1020 # needs to be updated, so this check is forced on all builds
1023 define filechk_utsrelease.h
1024 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1025 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1028 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1031 define filechk_version.h
1032 (echo \#define LINUX_VERSION_CODE $(shell \
1033 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1034 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1037 include/linux/version.h: $(srctree)/Makefile FORCE
1038 $(call filechk,version.h)
1040 include/generated/utsrelease.h: include/config/kernel.release FORCE
1041 $(call filechk,utsrelease.h)
1045 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1046 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1048 # ---------------------------------------------------------------------------
1052 @echo '*** Warning: make $@ is unnecessary now.'
1054 # ---------------------------------------------------------------------------
1056 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware/$(KERNELRELEASE)
1057 export INSTALL_FW_PATH
1059 PHONY += firmware_install
1060 firmware_install: FORCE
1061 @mkdir -p $(objtree)/firmware
1062 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1064 # ---------------------------------------------------------------------------
1067 #Default location for installed headers
1068 export INSTALL_HDR_PATH = $(objtree)/usr
1070 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1072 # If we do an all arch process set dst to asm-$(hdr-arch)
1073 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1075 PHONY += archheaders
1079 __headers: include/linux/version.h scripts_basic asm-generic archheaders FORCE
1080 $(Q)$(MAKE) $(build)=scripts build_unifdef
1082 PHONY += headers_install_all
1083 headers_install_all:
1084 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1086 PHONY += headers_install
1087 headers_install: __headers
1088 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1089 $(error Headers not exportable for the $(SRCARCH) architecture))
1090 $(Q)$(MAKE) $(hdr-inst)=include
1091 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1093 PHONY += headers_check_all
1094 headers_check_all: headers_install_all
1095 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1097 PHONY += headers_check
1098 headers_check: headers_install
1099 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1100 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1102 # ---------------------------------------------------------------------------
1105 ifdef CONFIG_MODULES
1107 # By default, build modules as well
1113 # A module can be listed more than once in obj-m resulting in
1114 # duplicate lines in modules.order files. Those are removed
1115 # using awk while concatenating to the final file.
1118 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1119 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1120 @$(kecho) ' Building modules, stage 2.';
1121 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1122 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1124 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1125 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1127 %/modules.builtin: include/config/auto.conf
1128 $(Q)$(MAKE) $(modbuiltin)=$*
1131 # Target to prepare building external modules
1132 PHONY += modules_prepare
1133 modules_prepare: prepare scripts
1135 # Target to install modules
1136 PHONY += modules_install
1137 modules_install: _modinst_ _modinst_post
1141 @rm -rf $(MODLIB)/kernel
1142 @rm -f $(MODLIB)/source
1143 @mkdir -p $(MODLIB)/kernel
1144 @ln -s $(srctree) $(MODLIB)/source
1145 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1146 rm -f $(MODLIB)/build ; \
1147 ln -s $(objtree) $(MODLIB)/build ; \
1149 @cp -f $(objtree)/modules.order $(MODLIB)/
1150 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1151 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1153 # This depmod is only for convenience to give the initial
1154 # boot a modules.dep even before / is mounted read-write. However the
1155 # boot script depmod is the master version.
1156 PHONY += _modinst_post
1157 _modinst_post: _modinst_
1158 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1161 else # CONFIG_MODULES
1163 # Modules not configured
1164 # ---------------------------------------------------------------------------
1166 modules modules_install: FORCE
1168 @echo "The present kernel configuration has modules disabled."
1169 @echo "Type 'make config' and enable loadable module support."
1170 @echo "Then build a kernel with module support enabled."
1174 endif # CONFIG_MODULES
1177 # Cleaning is done on three levels.
1178 # make clean Delete most generated files
1179 # Leave enough to build external modules
1180 # make mrproper Delete the current configuration, and all generated files
1181 # make distclean Remove editor backup files, patch leftover files and the like
1183 # Directories & files removed with 'make clean'
1184 CLEAN_DIRS += $(MODVERDIR)
1185 CLEAN_FILES += vmlinux System.map \
1186 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1188 # Directories & files removed with 'make mrproper'
1189 MRPROPER_DIRS += include/config usr/include include/generated \
1190 arch/*/include/generated
1191 MRPROPER_FILES += .config .config.old .version .old_version \
1192 include/linux/version.h \
1193 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1195 # clean - Delete most, but leave enough to build external modules
1197 clean: rm-dirs := $(CLEAN_DIRS)
1198 clean: rm-files := $(CLEAN_FILES)
1199 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1201 PHONY += $(clean-dirs) clean archclean
1203 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1207 # mrproper - Delete all generated files, including .config
1209 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1210 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1211 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1213 PHONY += $(mrproper-dirs) mrproper archmrproper
1215 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1217 mrproper: clean archmrproper $(mrproper-dirs)
1226 @find $(srctree) $(RCS_FIND_IGNORE) \
1227 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1228 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1230 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1231 -type f -print | xargs rm -f
1234 # Packaging of the kernel to various formats
1235 # ---------------------------------------------------------------------------
1236 # rpm target kept for backward compatibility
1237 package-dir := $(srctree)/scripts/package
1240 $(Q)$(MAKE) $(build)=$(package-dir) $@
1241 %pkg: include/config/kernel.release FORCE
1242 $(Q)$(MAKE) $(build)=$(package-dir) $@
1243 rpm: include/config/kernel.release FORCE
1244 $(Q)$(MAKE) $(build)=$(package-dir) $@
1247 # Brief documentation of the typical targets used
1248 # ---------------------------------------------------------------------------
1250 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1251 boards := $(notdir $(boards))
1252 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1253 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1256 @echo 'Cleaning targets:'
1257 @echo ' clean - Remove most generated files but keep the config and'
1258 @echo ' enough build support to build external modules'
1259 @echo ' mrproper - Remove all generated files + config + various backup files'
1260 @echo ' distclean - mrproper + remove editor backup and patch files'
1262 @echo 'Configuration targets:'
1263 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1265 @echo 'Other generic targets:'
1266 @echo ' all - Build all targets marked with [*]'
1267 @echo '* vmlinux - Build the bare kernel'
1268 @echo '* modules - Build all modules'
1269 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1270 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1271 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1272 @echo ' dir/ - Build all files in dir and below'
1273 @echo ' dir/file.[oisS] - Build specified target only'
1274 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1275 @echo ' (requires a recent binutils and recent build (System.map))'
1276 @echo ' dir/file.ko - Build module including final link'
1277 @echo ' modules_prepare - Set up for building external modules'
1278 @echo ' tags/TAGS - Generate tags file for editors'
1279 @echo ' cscope - Generate cscope index'
1280 @echo ' gtags - Generate GNU GLOBAL index'
1281 @echo ' kernelrelease - Output the release version string'
1282 @echo ' kernelversion - Output the version stored in Makefile'
1283 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1284 echo ' (default: $(INSTALL_HDR_PATH))'; \
1286 @echo 'Static analysers'
1287 @echo ' checkstack - Generate a list of stack hogs'
1288 @echo ' namespacecheck - Name space analysis on compiled kernel'
1289 @echo ' versioncheck - Sanity check on version.h usage'
1290 @echo ' includecheck - Check for duplicate included header files'
1291 @echo ' export_report - List the usages of all exported symbols'
1292 @echo ' headers_check - Sanity check on exported headers'
1293 @echo ' headerdep - Detect inclusion cycles in headers'
1294 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1296 @echo 'Kernel packaging:'
1297 @$(MAKE) $(build)=$(package-dir) help
1299 @echo 'Documentation targets:'
1300 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1302 @echo 'Architecture specific targets ($(SRCARCH)):'
1303 @$(if $(archhelp),$(archhelp),\
1304 echo ' No architecture specific help defined for $(SRCARCH)')
1307 $(foreach b, $(boards), \
1308 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1310 @$(if $(board-dirs), \
1311 $(foreach b, $(board-dirs), \
1312 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1313 printf " %-16s - Show all of the above\\n" help-boards; \
1316 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1317 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1318 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1319 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1320 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1321 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1322 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1323 @echo ' 1: warnings which may be relevant and do not occur too often'
1324 @echo ' 2: warnings which occur quite often but may still be relevant'
1325 @echo ' 3: more obscure warnings, can most likely be ignored'
1326 @echo ' Multiple levels can be combined with W=12 or W=123'
1328 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1329 @echo 'For further info see the ./README file'
1332 help-board-dirs := $(addprefix help-,$(board-dirs))
1334 help-boards: $(help-board-dirs)
1336 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1338 $(help-board-dirs): help-%:
1339 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1340 @$(if $(boards-per-dir), \
1341 $(foreach b, $(boards-per-dir), \
1342 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1346 # Documentation targets
1347 # ---------------------------------------------------------------------------
1348 %docs: scripts_basic FORCE
1349 $(Q)$(MAKE) $(build)=scripts build_docproc
1350 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1352 else # KBUILD_EXTMOD
1355 # External module support.
1356 # When building external modules the kernel used as basis is considered
1357 # read-only, and no consistency checks are made and the make
1358 # system is not used on the basis kernel. If updates are required
1359 # in the basis kernel ordinary make commands (without M=...) must
1362 # The following are the only valid targets when building external
1364 # make M=dir clean Delete all automatically generated files
1365 # make M=dir modules Make all modules in specified dir
1366 # make M=dir Same as 'make M=dir modules'
1367 # make M=dir modules_install
1368 # Install the modules built in the module directory
1369 # Assumes install directory is already created
1371 # We are always building modules
1373 PHONY += crmodverdir
1377 PHONY += $(objtree)/Module.symvers
1378 $(objtree)/Module.symvers:
1379 @test -e $(objtree)/Module.symvers || ( \
1381 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1382 echo " is missing; modules will have no dependencies and modversions."; \
1385 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1386 PHONY += $(module-dirs) modules
1387 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1388 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1390 modules: $(module-dirs)
1391 @$(kecho) ' Building modules, stage 2.';
1392 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1394 PHONY += modules_install
1395 modules_install: _emodinst_ _emodinst_post
1397 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1400 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1401 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1403 PHONY += _emodinst_post
1404 _emodinst_post: _emodinst_
1407 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1409 PHONY += $(clean-dirs) clean
1411 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1413 clean: rm-dirs := $(MODVERDIR)
1414 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1417 @echo ' Building external modules.'
1418 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1420 @echo ' modules - default target, build the module(s)'
1421 @echo ' modules_install - install the module'
1422 @echo ' clean - remove generated files in module directory only'
1426 PHONY += prepare scripts
1429 endif # KBUILD_EXTMOD
1431 clean: $(clean-dirs)
1434 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1435 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1436 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1437 -o -name '*.symtypes' -o -name 'modules.order' \
1438 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1439 -o -name '*.gcno' \) -type f -print | xargs rm -f
1441 # Generate tags for editors
1442 # ---------------------------------------------------------------------------
1443 quiet_cmd_tags = GEN $@
1444 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1446 tags TAGS cscope gtags: FORCE
1449 # Scripts to check various things for consistency
1450 # ---------------------------------------------------------------------------
1452 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1455 find $(srctree)/* $(RCS_FIND_IGNORE) \
1456 -name '*.[hcS]' -type f -print | sort \
1457 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1460 find $(srctree)/* $(RCS_FIND_IGNORE) \
1461 -name '*.[hcS]' -type f -print | sort \
1462 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1465 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1468 $(PERL) $(srctree)/scripts/namespace.pl
1471 $(PERL) $(srctree)/scripts/export_report.pl
1473 endif #ifeq ($(config-targets),1)
1474 endif #ifeq ($(mixed-targets),1)
1476 PHONY += checkstack kernelrelease kernelversion
1478 # UML needs a little special treatment here. It wants to use the host
1479 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1480 # else wants $(ARCH), including people doing cross-builds, which means
1481 # that $(SUBARCH) doesn't work here.
1483 CHECKSTACK_ARCH := $(SUBARCH)
1485 CHECKSTACK_ARCH := $(ARCH)
1488 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1489 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1492 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1495 @echo $(KERNELVERSION)
1498 # ---------------------------------------------------------------------------
1499 # Single targets are compatible with:
1500 # - build with mixed source and output
1501 # - build with separate output dir 'make O=...'
1502 # - external modules
1504 # target-dir => where to store outputfile
1505 # build-dir => directory in kernel source tree to use
1507 ifeq ($(KBUILD_EXTMOD),)
1508 build-dir = $(patsubst %/,%,$(dir $@))
1509 target-dir = $(dir $@)
1511 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1512 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1513 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1516 %.s: %.c prepare scripts FORCE
1517 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1518 %.i: %.c prepare scripts FORCE
1519 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1520 %.o: %.c prepare scripts FORCE
1521 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1522 %.lst: %.c prepare scripts FORCE
1523 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1524 %.s: %.S prepare scripts FORCE
1525 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526 %.o: %.S prepare scripts FORCE
1527 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1528 %.symtypes: %.c prepare scripts FORCE
1529 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1532 /: prepare scripts FORCE
1534 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1535 $(build)=$(build-dir)
1536 %/: prepare scripts FORCE
1538 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1539 $(build)=$(build-dir)
1540 %.ko: prepare scripts FORCE
1542 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1543 $(build)=$(build-dir) $(@:.ko=.o)
1544 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1546 # FIXME Should go into a make.lib or something
1547 # ===========================================================================
1549 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1550 cmd_rmdirs = rm -rf $(rm-dirs)
1552 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1553 cmd_rmfiles = rm -f $(rm-files)
1555 # Run depmod only if we have System.map and depmod is executable
1556 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1557 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1560 # Create temporary dir for module support files
1561 # clean it up only when building all modules
1562 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1563 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1565 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1566 $(KBUILD_AFLAGS_KERNEL) \
1567 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1568 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1570 quiet_cmd_as_o_S = AS $@
1571 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1573 # read all saved command lines
1575 targets := $(wildcard $(sort $(targets)))
1576 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1578 ifneq ($(cmd_files),)
1579 $(cmd_files): ; # Do not try to update included dependency files
1580 include $(cmd_files)
1583 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1585 # $(Q)$(MAKE) $(clean)=dir
1586 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1588 endif # skip-makefile
1593 # Declare the contents of the .PHONY variable as phony. We keep that
1594 # information in a variable so we can use it in if_changed and friends.