Merge branch 'rtc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / Makefile
blob5e40aa2acbff70ca619933b025ed09644ee56df9
1 VERSION = 2
2 PATCHLEVEL = 6
3 SUBLEVEL = 38
4 EXTRAVERSION = -rc5
5 NAME = Flesh-Eating Bats with Fangs
7 # *DOCUMENTATION*
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.
13 # Do not:
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
20 unexport LC_ALL
21 LC_COLLATE=C
22 LC_NUMERIC=C
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
34 # is now up to date.
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
39 # prepare rule.
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")
45 KBUILD_VERBOSE = $(V)
46 endif
47 ifndef KBUILD_VERBOSE
48 KBUILD_VERBOSE = 0
49 endif
51 # Call a source code checker (by default, "sparse") as part of the
52 # C compilation.
54 # Use 'make C=1' to enable checking of only re-compiled files.
55 # Use 'make C=2' to enable checking of *all* source files, regardless
56 # of whether they are re-compiled or not.
58 # See the file "Documentation/sparse.txt" for more details, including
59 # where to get the "sparse" utility.
61 ifeq ("$(origin C)", "command line")
62 KBUILD_CHECKSRC = $(C)
63 endif
64 ifndef KBUILD_CHECKSRC
65 KBUILD_CHECKSRC = 0
66 endif
68 # Use make M=dir to specify directory of external module to build
69 # Old syntax make ... SUBDIRS=$PWD is still supported
70 # Setting the environment variable KBUILD_EXTMOD take precedence
71 ifdef SUBDIRS
72 KBUILD_EXTMOD ?= $(SUBDIRS)
73 endif
75 ifeq ("$(origin M)", "command line")
76 KBUILD_EXTMOD := $(M)
77 endif
79 # kbuild supports saving output files in a separate directory.
80 # To locate output files in a separate directory two syntaxes are supported.
81 # In both cases the working directory must be the root of the kernel src.
82 # 1) O=
83 # Use "make O=dir/to/store/output/files/"
85 # 2) Set KBUILD_OUTPUT
86 # Set the environment variable KBUILD_OUTPUT to point to the directory
87 # where the output files shall be placed.
88 # export KBUILD_OUTPUT=dir/to/store/output/files/
89 # make
91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
92 # variable.
95 # KBUILD_SRC is set on invocation of make in OBJ directory
96 # KBUILD_SRC is not intended to be used by the regular user (for now)
97 ifeq ($(KBUILD_SRC),)
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)
103 endif
105 # That's our default target when none is given on the command line
106 PHONY := _all
107 _all:
109 # Cancel implicit rules on top Makefile
110 $(CURDIR)/Makefile Makefile: ;
112 ifneq ($(KBUILD_OUTPUT),)
113 # Invoke a second make in the output directory, passing relevant variables
114 # check that the output directory actually exists
115 saved-output := $(KBUILD_OUTPUT)
116 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
117 $(if $(KBUILD_OUTPUT),, \
118 $(error output directory "$(saved-output)" does not exist))
120 PHONY += $(MAKECMDGOALS) sub-make
122 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
123 $(Q)@:
125 sub-make: FORCE
126 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
127 KBUILD_SRC=$(CURDIR) \
128 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
129 $(filter-out _all sub-make,$(MAKECMDGOALS))
131 # Leave processing to above invocation of make
132 skip-makefile := 1
133 endif # ifneq ($(KBUILD_OUTPUT),)
134 endif # ifeq ($(KBUILD_SRC),)
136 # We process the rest of the Makefile if this is the final invocation of make
137 ifeq ($(skip-makefile),)
139 # If building an external module we do not care about the all: rule
140 # but instead _all depend on modules
141 PHONY += all
142 ifeq ($(KBUILD_EXTMOD),)
143 _all: all
144 else
145 _all: modules
146 endif
148 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
149 objtree := $(CURDIR)
150 src := $(srctree)
151 obj := $(objtree)
153 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
155 export srctree objtree VPATH
158 # SUBARCH tells the usermode build what the underlying arch is. That is set
159 # first, and if a usermode build is happening, the "ARCH=um" on the command
160 # line overrides the setting of ARCH below. If a native build is happening,
161 # then ARCH is assigned, getting whatever value it gets normally, and
162 # SUBARCH is subsequently ignored.
164 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
165 -e s/arm.*/arm/ -e s/sa110/arm/ \
166 -e s/s390x/s390/ -e s/parisc64/parisc/ \
167 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
168 -e s/sh[234].*/sh/ )
170 # Cross compiling and selecting different set of gcc/bin-utils
171 # ---------------------------------------------------------------------------
173 # When performing cross compilation for other architectures ARCH shall be set
174 # to the target architecture. (See arch/* for the possibilities).
175 # ARCH can be set during invocation of make:
176 # make ARCH=ia64
177 # Another way is to have ARCH set in the environment.
178 # The default ARCH is the host where make is executed.
180 # CROSS_COMPILE specify the prefix used for all executables used
181 # during compilation. Only gcc and related bin-utils executables
182 # are prefixed with $(CROSS_COMPILE).
183 # CROSS_COMPILE can be set on the command line
184 # make CROSS_COMPILE=ia64-linux-
185 # Alternatively CROSS_COMPILE can be set in the environment.
186 # A third alternative is to store a setting in .config so that plain
187 # "make" in the configured kernel build directory always uses that.
188 # Default value for CROSS_COMPILE is not to prefix executables
189 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
190 export KBUILD_BUILDHOST := $(SUBARCH)
191 ARCH ?= $(SUBARCH)
192 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
194 # Architecture as present in compile.h
195 UTS_MACHINE := $(ARCH)
196 SRCARCH := $(ARCH)
198 # Additional ARCH settings for x86
199 ifeq ($(ARCH),i386)
200 SRCARCH := x86
201 endif
202 ifeq ($(ARCH),x86_64)
203 SRCARCH := x86
204 endif
206 # Additional ARCH settings for sparc
207 ifeq ($(ARCH),sparc32)
208 SRCARCH := sparc
209 endif
210 ifeq ($(ARCH),sparc64)
211 SRCARCH := sparc
212 endif
214 # Additional ARCH settings for sh
215 ifeq ($(ARCH),sh64)
216 SRCARCH := sh
217 endif
219 # Where to locate arch specific headers
220 hdr-arch := $(SRCARCH)
222 ifeq ($(ARCH),m68knommu)
223 hdr-arch := m68k
224 endif
226 KCONFIG_CONFIG ?= .config
227 export KCONFIG_CONFIG
229 # SHELL used by kbuild
230 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
231 else if [ -x /bin/bash ]; then echo /bin/bash; \
232 else echo sh; fi ; fi)
234 HOSTCC = gcc
235 HOSTCXX = g++
236 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
237 HOSTCXXFLAGS = -O2
239 # Decide whether to build built-in, modular, or both.
240 # Normally, just do built-in.
242 KBUILD_MODULES :=
243 KBUILD_BUILTIN := 1
245 # If we have only "make modules", don't compile built-in objects.
246 # When we're building modules with modversions, we need to consider
247 # the built-in objects during the descend as well, in order to
248 # make sure the checksums are up to date before we record them.
250 ifeq ($(MAKECMDGOALS),modules)
251 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
252 endif
254 # If we have "make <whatever> modules", compile modules
255 # in addition to whatever we do anyway.
256 # Just "make" or "make all" shall build modules as well
258 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
259 KBUILD_MODULES := 1
260 endif
262 ifeq ($(MAKECMDGOALS),)
263 KBUILD_MODULES := 1
264 endif
266 export KBUILD_MODULES KBUILD_BUILTIN
267 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
269 # Beautify output
270 # ---------------------------------------------------------------------------
272 # Normally, we echo the whole command before executing it. By making
273 # that echo $($(quiet)$(cmd)), we now have the possibility to set
274 # $(quiet) to choose other forms of output instead, e.g.
276 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
277 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
279 # If $(quiet) is empty, the whole command will be printed.
280 # If it is set to "quiet_", only the short version will be printed.
281 # If it is set to "silent_", nothing will be printed at all, since
282 # the variable $(silent_cmd_cc_o_c) doesn't exist.
284 # A simple variant is to prefix commands with $(Q) - that's useful
285 # for commands that shall be hidden in non-verbose mode.
287 # $(Q)ln $@ :<
289 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
290 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
292 ifeq ($(KBUILD_VERBOSE),1)
293 quiet =
295 else
296 quiet=quiet_
297 Q = @
298 endif
300 # If the user is running make -s (silent mode), suppress echoing of
301 # commands
303 ifneq ($(findstring s,$(MAKEFLAGS)),)
304 quiet=silent_
305 endif
307 export quiet Q KBUILD_VERBOSE
310 # Look for make include files relative to root of kernel src
311 MAKEFLAGS += --include-dir=$(srctree)
313 # We need some generic definitions (do not try to remake the file).
314 $(srctree)/scripts/Kbuild.include: ;
315 include $(srctree)/scripts/Kbuild.include
317 # Make variables (CC, etc...)
319 AS = $(CROSS_COMPILE)as
320 LD = $(CROSS_COMPILE)ld
321 CC = $(CROSS_COMPILE)gcc
322 CPP = $(CC) -E
323 AR = $(CROSS_COMPILE)ar
324 NM = $(CROSS_COMPILE)nm
325 STRIP = $(CROSS_COMPILE)strip
326 OBJCOPY = $(CROSS_COMPILE)objcopy
327 OBJDUMP = $(CROSS_COMPILE)objdump
328 AWK = awk
329 GENKSYMS = scripts/genksyms/genksyms
330 INSTALLKERNEL := installkernel
331 DEPMOD = /sbin/depmod
332 KALLSYMS = scripts/kallsyms
333 PERL = perl
334 CHECK = sparse
336 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
337 -Wbitwise -Wno-return-void $(CF)
338 CFLAGS_MODULE =
339 AFLAGS_MODULE =
340 LDFLAGS_MODULE =
341 CFLAGS_KERNEL =
342 AFLAGS_KERNEL =
343 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
346 # Use LINUXINCLUDE when you must reference the include/ directory.
347 # Needed to be compatible with the O= option
348 LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include -Iinclude \
349 $(if $(KBUILD_SRC), -I$(srctree)/include) \
350 -include include/generated/autoconf.h
352 KBUILD_CPPFLAGS := -D__KERNEL__
354 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
355 -fno-strict-aliasing -fno-common \
356 -Werror-implicit-function-declaration \
357 -Wno-format-security \
358 -fno-delete-null-pointer-checks
359 KBUILD_AFLAGS_KERNEL :=
360 KBUILD_CFLAGS_KERNEL :=
361 KBUILD_AFLAGS := -D__ASSEMBLY__
362 KBUILD_AFLAGS_MODULE := -DMODULE
363 KBUILD_CFLAGS_MODULE := -DMODULE
364 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
366 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
367 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
368 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
370 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
371 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
372 export CPP AR NM STRIP OBJCOPY OBJDUMP
373 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
374 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
376 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
377 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
378 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
379 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
380 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
382 # When compiling out-of-tree modules, put MODVERDIR in the module
383 # tree rather than in the kernel tree. The kernel tree might
384 # even be read-only.
385 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
387 # Files to ignore in find ... statements
389 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
390 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
392 # ===========================================================================
393 # Rules shared between *config targets and build targets
395 # Basic helpers built in scripts/
396 PHONY += scripts_basic
397 scripts_basic:
398 $(Q)$(MAKE) $(build)=scripts/basic
399 $(Q)rm -f .tmp_quiet_recordmcount
401 # To avoid any implicit rule to kick in, define an empty command.
402 scripts/basic/%: scripts_basic ;
404 PHONY += outputmakefile
405 # outputmakefile generates a Makefile in the output directory, if using a
406 # separate output directory. This allows convenient use of make in the
407 # output directory.
408 outputmakefile:
409 ifneq ($(KBUILD_SRC),)
410 $(Q)ln -fsn $(srctree) source
411 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
412 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
413 endif
415 # To make sure we do not include .config for any of the *config targets
416 # catch them early, and hand them over to scripts/kconfig/Makefile
417 # It is allowed to specify more targets when calling make, including
418 # mixing *config targets and build targets.
419 # For example 'make oldconfig all'.
420 # Detect when mixed targets is specified, and make a second invocation
421 # of make so .config is not included in this case either (for *config).
423 no-dot-config-targets := clean mrproper distclean \
424 cscope TAGS tags help %docs check% coccicheck \
425 include/linux/version.h headers_% \
426 kernelversion %src-pkg
428 config-targets := 0
429 mixed-targets := 0
430 dot-config := 1
432 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
433 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
434 dot-config := 0
435 endif
436 endif
438 ifeq ($(KBUILD_EXTMOD),)
439 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
440 config-targets := 1
441 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
442 mixed-targets := 1
443 endif
444 endif
445 endif
447 ifeq ($(mixed-targets),1)
448 # ===========================================================================
449 # We're called with mixed targets (*config and build targets).
450 # Handle them one by one.
452 %:: FORCE
453 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
455 else
456 ifeq ($(config-targets),1)
457 # ===========================================================================
458 # *config targets only - make sure prerequisites are updated, and descend
459 # in scripts/kconfig to make the *config target
461 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
462 # KBUILD_DEFCONFIG may point out an alternative default configuration
463 # used for 'make defconfig'
464 include $(srctree)/arch/$(SRCARCH)/Makefile
465 export KBUILD_DEFCONFIG KBUILD_KCONFIG
467 config: scripts_basic outputmakefile FORCE
468 $(Q)mkdir -p include/linux include/config
469 $(Q)$(MAKE) $(build)=scripts/kconfig $@
471 %config: scripts_basic outputmakefile FORCE
472 $(Q)mkdir -p include/linux include/config
473 $(Q)$(MAKE) $(build)=scripts/kconfig $@
475 else
476 # ===========================================================================
477 # Build targets only - this includes vmlinux, arch specific targets, clean
478 # targets and others. In general all targets except *config targets.
480 ifeq ($(KBUILD_EXTMOD),)
481 # Additional helpers built in scripts/
482 # Carefully list dependencies so we do not try to build scripts twice
483 # in parallel
484 PHONY += scripts
485 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
486 $(Q)$(MAKE) $(build)=$(@)
488 # Objects we will link into vmlinux / subdirs we need to visit
489 init-y := init/
490 drivers-y := drivers/ sound/ firmware/
491 net-y := net/
492 libs-y := lib/
493 core-y := usr/
494 endif # KBUILD_EXTMOD
496 ifeq ($(dot-config),1)
497 # Read in config
498 -include include/config/auto.conf
500 ifeq ($(KBUILD_EXTMOD),)
501 # Read in dependencies to all Kconfig* files, make sure to run
502 # oldconfig if changes are detected.
503 -include include/config/auto.conf.cmd
505 # To avoid any implicit rule to kick in, define an empty command
506 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
508 # If .config is newer than include/config/auto.conf, someone tinkered
509 # with it and forgot to run make oldconfig.
510 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
511 # we execute the config step to be sure to catch updated Kconfig files
512 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
513 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
514 else
515 # external modules needs include/generated/autoconf.h and include/config/auto.conf
516 # but do not care if they are up-to-date. Use auto.conf to trigger the test
517 PHONY += include/config/auto.conf
519 include/config/auto.conf:
520 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
521 echo; \
522 echo " ERROR: Kernel configuration is invalid."; \
523 echo " include/generated/autoconf.h or $@ are missing.";\
524 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
525 echo; \
526 /bin/false)
528 endif # KBUILD_EXTMOD
530 else
531 # Dummy target needed, because used as prerequisite
532 include/config/auto.conf: ;
533 endif # $(dot-config)
535 # The all: target is the default when no target is given on the
536 # command line.
537 # This allow a user to issue only 'make' to build a kernel including modules
538 # Defaults to vmlinux, but the arch makefile usually adds further targets
539 all: vmlinux
541 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
542 KBUILD_CFLAGS += -Os
543 else
544 KBUILD_CFLAGS += -O2
545 endif
547 include $(srctree)/arch/$(SRCARCH)/Makefile
549 ifneq ($(CONFIG_FRAME_WARN),0)
550 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
551 endif
553 # Force gcc to behave correct even for buggy distributions
554 ifndef CONFIG_CC_STACKPROTECTOR
555 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
556 endif
558 ifdef CONFIG_FRAME_POINTER
559 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
560 else
561 # Some targets (ARM with Thumb2, for example), can't be built with frame
562 # pointers. For those, we don't have FUNCTION_TRACER automatically
563 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
564 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
565 # -fomit-frame-pointer with FUNCTION_TRACER.
566 ifndef CONFIG_FUNCTION_TRACER
567 KBUILD_CFLAGS += -fomit-frame-pointer
568 endif
569 endif
571 ifdef CONFIG_DEBUG_INFO
572 KBUILD_CFLAGS += -g
573 KBUILD_AFLAGS += -gdwarf-2
574 endif
576 ifdef CONFIG_DEBUG_INFO_REDUCED
577 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
578 endif
580 ifdef CONFIG_FUNCTION_TRACER
581 KBUILD_CFLAGS += -pg
582 ifdef CONFIG_DYNAMIC_FTRACE
583 ifdef CONFIG_HAVE_C_RECORDMCOUNT
584 BUILD_C_RECORDMCOUNT := y
585 export BUILD_C_RECORDMCOUNT
586 endif
587 endif
588 endif
590 # We trigger additional mismatches with less inlining
591 ifdef CONFIG_DEBUG_SECTION_MISMATCH
592 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
593 endif
595 # arch Makefile may override CC so keep this after arch Makefile is included
596 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
597 CHECKFLAGS += $(NOSTDINC_FLAGS)
599 # warn about C99 declaration after statement
600 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
602 # disable pointer signed / unsigned warnings in gcc 4.0
603 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
605 # disable invalid "can't wrap" optimizations for signed / pointers
606 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
608 # conserve stack if available
609 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
611 # check for 'asm goto'
612 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
613 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
614 endif
616 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
617 # But warn user when we do so
618 warn-assign = \
619 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
621 ifneq ($(KCPPFLAGS),)
622 $(call warn-assign,CPPFLAGS)
623 KBUILD_CPPFLAGS += $(KCPPFLAGS)
624 endif
625 ifneq ($(KAFLAGS),)
626 $(call warn-assign,AFLAGS)
627 KBUILD_AFLAGS += $(KAFLAGS)
628 endif
629 ifneq ($(KCFLAGS),)
630 $(call warn-assign,CFLAGS)
631 KBUILD_CFLAGS += $(KCFLAGS)
632 endif
634 # Use --build-id when available.
635 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
636 $(call cc-ldoption, -Wl$(comma)--build-id,))
637 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
638 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
640 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
641 LDFLAGS_vmlinux += $(call ld-option, -X,)
642 endif
644 # Default kernel image to build when no specific target is given.
645 # KBUILD_IMAGE may be overruled on the command line or
646 # set in the environment
647 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
648 # this default value
649 export KBUILD_IMAGE ?= vmlinux
652 # INSTALL_PATH specifies where to place the updated kernel and system map
653 # images. Default is /boot, but you can set it to other values
654 export INSTALL_PATH ?= /boot
657 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
658 # relocations required by build roots. This is not defined in the
659 # makefile but the argument can be passed to make if needed.
662 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
663 export MODLIB
666 # INSTALL_MOD_STRIP, if defined, will cause modules to be
667 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
668 # the default option --strip-debug will be used. Otherwise,
669 # INSTALL_MOD_STRIP will used as the options to the strip command.
671 ifdef INSTALL_MOD_STRIP
672 ifeq ($(INSTALL_MOD_STRIP),1)
673 mod_strip_cmd = $(STRIP) --strip-debug
674 else
675 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
676 endif # INSTALL_MOD_STRIP=1
677 else
678 mod_strip_cmd = true
679 endif # INSTALL_MOD_STRIP
680 export mod_strip_cmd
683 ifeq ($(KBUILD_EXTMOD),)
684 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
686 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
687 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
688 $(net-y) $(net-m) $(libs-y) $(libs-m)))
690 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
691 $(init-n) $(init-) \
692 $(core-n) $(core-) $(drivers-n) $(drivers-) \
693 $(net-n) $(net-) $(libs-n) $(libs-))))
695 init-y := $(patsubst %/, %/built-in.o, $(init-y))
696 core-y := $(patsubst %/, %/built-in.o, $(core-y))
697 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
698 net-y := $(patsubst %/, %/built-in.o, $(net-y))
699 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
700 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
701 libs-y := $(libs-y1) $(libs-y2)
703 # Build vmlinux
704 # ---------------------------------------------------------------------------
705 # vmlinux is built from the objects selected by $(vmlinux-init) and
706 # $(vmlinux-main). Most are built-in.o files from top-level directories
707 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
708 # Ordering when linking is important, and $(vmlinux-init) must be first.
710 # vmlinux
713 # +-< $(vmlinux-init)
714 # | +--< init/version.o + more
716 # +--< $(vmlinux-main)
717 # | +--< driver/built-in.o mm/built-in.o + more
719 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
721 # vmlinux version (uname -v) cannot be updated during normal
722 # descending-into-subdirs phase since we do not yet know if we need to
723 # update vmlinux.
724 # Therefore this step is delayed until just before final link of vmlinux -
725 # except in the kallsyms case where it is done just before adding the
726 # symbols to the kernel.
728 # System.map is generated to document addresses of all kernel symbols
730 vmlinux-init := $(head-y) $(init-y)
731 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
732 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
733 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
734 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
736 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
737 # May be overridden by arch/$(ARCH)/Makefile
738 quiet_cmd_vmlinux__ ?= LD $@
739 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
740 -T $(vmlinux-lds) $(vmlinux-init) \
741 --start-group $(vmlinux-main) --end-group \
742 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
744 # Generate new vmlinux version
745 quiet_cmd_vmlinux_version = GEN .version
746 cmd_vmlinux_version = set -e; \
747 if [ ! -r .version ]; then \
748 rm -f .version; \
749 echo 1 >.version; \
750 else \
751 mv .version .old_version; \
752 expr 0$$(cat .old_version) + 1 >.version; \
753 fi; \
754 $(MAKE) $(build)=init
756 # Generate System.map
757 quiet_cmd_sysmap = SYSMAP
758 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
760 # Link of vmlinux
761 # If CONFIG_KALLSYMS is set .version is already updated
762 # Generate System.map and verify that the content is consistent
763 # Use + in front of the vmlinux_version rule to silent warning with make -j2
764 # First command is ':' to allow us to use + in front of the rule
765 define rule_vmlinux__
767 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
769 $(call cmd,vmlinux__)
770 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
772 $(Q)$(if $($(quiet)cmd_sysmap), \
773 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
774 $(cmd_sysmap) $@ System.map; \
775 if [ $$? -ne 0 ]; then \
776 rm -f $@; \
777 /bin/false; \
779 $(verify_kallsyms)
780 endef
783 ifdef CONFIG_KALLSYMS
784 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
785 # It's a three stage process:
786 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
787 # empty
788 # Running kallsyms on that gives us .tmp_kallsyms1.o with
789 # the right size - vmlinux version (uname -v) is updated during this step
790 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
791 # but due to the added section, some addresses have shifted.
792 # From here, we generate a correct .tmp_kallsyms2.o
793 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
794 # o Verify that the System.map from vmlinux matches the map from
795 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
796 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
797 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
798 # temporary bypass to allow the kernel to be built while the
799 # maintainers work out what went wrong with kallsyms.
801 ifdef CONFIG_KALLSYMS_EXTRA_PASS
802 last_kallsyms := 3
803 else
804 last_kallsyms := 2
805 endif
807 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
809 define verify_kallsyms
810 $(Q)$(if $($(quiet)cmd_sysmap), \
811 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
812 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
813 $(Q)cmp -s System.map .tmp_System.map || \
814 (echo Inconsistent kallsyms data; \
815 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
816 rm .tmp_kallsyms* ; /bin/false )
817 endef
819 # Update vmlinux version before link
820 # Use + in front of this rule to silent warning about make -j1
821 # First command is ':' to allow us to use + in front of this rule
822 cmd_ksym_ld = $(cmd_vmlinux__)
823 define rule_ksym_ld
825 +$(call cmd,vmlinux_version)
826 $(call cmd,vmlinux__)
827 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
828 endef
830 # Generate .S file with all kernel symbols
831 quiet_cmd_kallsyms = KSYM $@
832 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
833 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
835 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
836 $(call if_changed_dep,as_o_S)
838 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
839 $(call cmd,kallsyms)
841 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
842 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
843 $(call if_changed_rule,ksym_ld)
845 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
846 $(call if_changed,vmlinux__)
848 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
849 $(call if_changed,vmlinux__)
851 # Needs to visit scripts/ before $(KALLSYMS) can be used.
852 $(KALLSYMS): scripts ;
854 # Generate some data for debugging strange kallsyms problems
855 debug_kallsyms: .tmp_map$(last_kallsyms)
857 .tmp_map%: .tmp_vmlinux% FORCE
858 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
860 .tmp_map3: .tmp_map2
862 .tmp_map2: .tmp_map1
864 endif # ifdef CONFIG_KALLSYMS
866 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
867 # relevant sections renamed as per the linker script.
868 quiet_cmd_vmlinux-modpost = LD $@
869 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
870 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
871 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
872 define rule_vmlinux-modpost
874 +$(call cmd,vmlinux-modpost)
875 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
876 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
877 endef
879 # vmlinux image - including updated kernel symbols
880 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
881 ifdef CONFIG_HEADERS_CHECK
882 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
883 endif
884 ifdef CONFIG_SAMPLES
885 $(Q)$(MAKE) $(build)=samples
886 endif
887 ifdef CONFIG_BUILD_DOCSRC
888 $(Q)$(MAKE) $(build)=Documentation
889 endif
890 $(call vmlinux-modpost)
891 $(call if_changed_rule,vmlinux__)
892 $(Q)rm -f .old_version
894 # build vmlinux.o first to catch section mismatch errors early
895 ifdef CONFIG_KALLSYMS
896 .tmp_vmlinux1: vmlinux.o
897 endif
899 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
900 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
901 $(call if_changed_rule,vmlinux-modpost)
903 # The actual objects are generated when descending,
904 # make sure no implicit rule kicks in
905 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
907 # Handle descending into subdirectories listed in $(vmlinux-dirs)
908 # Preset locale variables to speed up the build process. Limit locale
909 # tweaks to this spot to avoid wrong language settings when running
910 # make menuconfig etc.
911 # Error messages still appears in the original language
913 PHONY += $(vmlinux-dirs)
914 $(vmlinux-dirs): prepare scripts
915 $(Q)$(MAKE) $(build)=$@
917 # Store (new) KERNELRELASE string in include/config/kernel.release
918 include/config/kernel.release: include/config/auto.conf FORCE
919 $(Q)rm -f $@
920 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
923 # Things we need to do before we recursively start building the kernel
924 # or the modules are listed in "prepare".
925 # A multi level approach is used. prepareN is processed before prepareN-1.
926 # archprepare is used in arch Makefiles and when processed asm symlink,
927 # version.h and scripts_basic is processed / created.
929 # Listed in dependency order
930 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
932 # prepare3 is used to check if we are building in a separate output directory,
933 # and if so do:
934 # 1) Check that make has not been executed in the kernel src $(srctree)
935 prepare3: include/config/kernel.release
936 ifneq ($(KBUILD_SRC),)
937 @$(kecho) ' Using $(srctree) as source for kernel'
938 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
939 echo " $(srctree) is not clean, please run 'make mrproper'";\
940 echo " in the '$(srctree)' directory.";\
941 /bin/false; \
943 endif
945 # prepare2 creates a makefile if using a separate output directory
946 prepare2: prepare3 outputmakefile
948 prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
949 include/config/auto.conf
950 $(cmd_crmodverdir)
952 archprepare: prepare1 scripts_basic
954 prepare0: archprepare FORCE
955 $(Q)$(MAKE) $(build)=.
956 $(Q)$(MAKE) $(build)=. missing-syscalls
958 # All the preparing..
959 prepare: prepare0
961 # Generate some files
962 # ---------------------------------------------------------------------------
964 # KERNELRELEASE can change from a few different places, meaning version.h
965 # needs to be updated, so this check is forced on all builds
967 uts_len := 64
968 define filechk_utsrelease.h
969 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
970 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
971 exit 1; \
972 fi; \
973 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
974 endef
976 define filechk_version.h
977 (echo \#define LINUX_VERSION_CODE $(shell \
978 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
979 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
980 endef
982 include/linux/version.h: $(srctree)/Makefile FORCE
983 $(call filechk,version.h)
985 include/generated/utsrelease.h: include/config/kernel.release FORCE
986 $(call filechk,utsrelease.h)
988 PHONY += headerdep
989 headerdep:
990 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
992 # ---------------------------------------------------------------------------
994 PHONY += depend dep
995 depend dep:
996 @echo '*** Warning: make $@ is unnecessary now.'
998 # ---------------------------------------------------------------------------
999 # Firmware install
1000 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1001 export INSTALL_FW_PATH
1003 PHONY += firmware_install
1004 firmware_install: FORCE
1005 @mkdir -p $(objtree)/firmware
1006 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1008 # ---------------------------------------------------------------------------
1009 # Kernel headers
1011 #Default location for installed headers
1012 export INSTALL_HDR_PATH = $(objtree)/usr
1014 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1016 # If we do an all arch process set dst to asm-$(hdr-arch)
1017 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1019 PHONY += __headers
1020 __headers: include/linux/version.h scripts_basic FORCE
1021 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1023 PHONY += headers_install_all
1024 headers_install_all:
1025 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1027 PHONY += headers_install
1028 headers_install: __headers
1029 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1030 $(error Headers not exportable for the $(SRCARCH) architecture))
1031 $(Q)$(MAKE) $(hdr-inst)=include
1032 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1034 PHONY += headers_check_all
1035 headers_check_all: headers_install_all
1036 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1038 PHONY += headers_check
1039 headers_check: headers_install
1040 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1041 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1043 # ---------------------------------------------------------------------------
1044 # Modules
1046 ifdef CONFIG_MODULES
1048 # By default, build modules as well
1050 all: modules
1052 # Build modules
1054 # A module can be listed more than once in obj-m resulting in
1055 # duplicate lines in modules.order files. Those are removed
1056 # using awk while concatenating to the final file.
1058 PHONY += modules
1059 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1060 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1061 @$(kecho) ' Building modules, stage 2.';
1062 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1063 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1065 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1066 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1068 %/modules.builtin: include/config/auto.conf
1069 $(Q)$(MAKE) $(modbuiltin)=$*
1072 # Target to prepare building external modules
1073 PHONY += modules_prepare
1074 modules_prepare: prepare scripts
1076 # Target to install modules
1077 PHONY += modules_install
1078 modules_install: _modinst_ _modinst_post
1080 PHONY += _modinst_
1081 _modinst_:
1082 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1083 echo "Warning: you may need to install module-init-tools"; \
1084 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1085 sleep 1; \
1087 @rm -rf $(MODLIB)/kernel
1088 @rm -f $(MODLIB)/source
1089 @mkdir -p $(MODLIB)/kernel
1090 @ln -s $(srctree) $(MODLIB)/source
1091 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1092 rm -f $(MODLIB)/build ; \
1093 ln -s $(objtree) $(MODLIB)/build ; \
1095 @cp -f $(objtree)/modules.order $(MODLIB)/
1096 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1097 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1099 # This depmod is only for convenience to give the initial
1100 # boot a modules.dep even before / is mounted read-write. However the
1101 # boot script depmod is the master version.
1102 PHONY += _modinst_post
1103 _modinst_post: _modinst_
1104 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1105 $(call cmd,depmod)
1107 else # CONFIG_MODULES
1109 # Modules not configured
1110 # ---------------------------------------------------------------------------
1112 modules modules_install: FORCE
1113 @echo
1114 @echo "The present kernel configuration has modules disabled."
1115 @echo "Type 'make config' and enable loadable module support."
1116 @echo "Then build a kernel with module support enabled."
1117 @echo
1118 @exit 1
1120 endif # CONFIG_MODULES
1123 # Cleaning is done on three levels.
1124 # make clean Delete most generated files
1125 # Leave enough to build external modules
1126 # make mrproper Delete the current configuration, and all generated files
1127 # make distclean Remove editor backup files, patch leftover files and the like
1129 # Directories & files removed with 'make clean'
1130 CLEAN_DIRS += $(MODVERDIR)
1131 CLEAN_FILES += vmlinux System.map \
1132 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1134 # Directories & files removed with 'make mrproper'
1135 MRPROPER_DIRS += include/config usr/include include/generated
1136 MRPROPER_FILES += .config .config.old .version .old_version \
1137 include/linux/version.h \
1138 Module.symvers tags TAGS cscope*
1140 # clean - Delete most, but leave enough to build external modules
1142 clean: rm-dirs := $(CLEAN_DIRS)
1143 clean: rm-files := $(CLEAN_FILES)
1144 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1146 PHONY += $(clean-dirs) clean archclean
1147 $(clean-dirs):
1148 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1150 clean: archclean
1152 # mrproper - Delete all generated files, including .config
1154 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1155 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1156 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1158 PHONY += $(mrproper-dirs) mrproper archmrproper
1159 $(mrproper-dirs):
1160 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1162 mrproper: clean archmrproper $(mrproper-dirs)
1163 $(call cmd,rmdirs)
1164 $(call cmd,rmfiles)
1166 # distclean
1168 PHONY += distclean
1170 distclean: mrproper
1171 @find $(srctree) $(RCS_FIND_IGNORE) \
1172 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1173 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1174 -o -name '.*.rej' -o -size 0 \
1175 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1176 -type f -print | xargs rm -f
1179 # Packaging of the kernel to various formats
1180 # ---------------------------------------------------------------------------
1181 # rpm target kept for backward compatibility
1182 package-dir := $(srctree)/scripts/package
1184 %src-pkg: FORCE
1185 $(Q)$(MAKE) $(build)=$(package-dir) $@
1186 %pkg: include/config/kernel.release FORCE
1187 $(Q)$(MAKE) $(build)=$(package-dir) $@
1188 rpm: include/config/kernel.release FORCE
1189 $(Q)$(MAKE) $(build)=$(package-dir) $@
1192 # Brief documentation of the typical targets used
1193 # ---------------------------------------------------------------------------
1195 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1196 boards := $(notdir $(boards))
1197 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1198 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1200 help:
1201 @echo 'Cleaning targets:'
1202 @echo ' clean - Remove most generated files but keep the config and'
1203 @echo ' enough build support to build external modules'
1204 @echo ' mrproper - Remove all generated files + config + various backup files'
1205 @echo ' distclean - mrproper + remove editor backup and patch files'
1206 @echo ''
1207 @echo 'Configuration targets:'
1208 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1209 @echo ''
1210 @echo 'Other generic targets:'
1211 @echo ' all - Build all targets marked with [*]'
1212 @echo '* vmlinux - Build the bare kernel'
1213 @echo '* modules - Build all modules'
1214 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1215 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1216 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1217 @echo ' dir/ - Build all files in dir and below'
1218 @echo ' dir/file.[oisS] - Build specified target only'
1219 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1220 @echo ' (requires a recent binutils and recent build (System.map))'
1221 @echo ' dir/file.ko - Build module including final link'
1222 @echo ' modules_prepare - Set up for building external modules'
1223 @echo ' tags/TAGS - Generate tags file for editors'
1224 @echo ' cscope - Generate cscope index'
1225 @echo ' kernelrelease - Output the release version string'
1226 @echo ' kernelversion - Output the version stored in Makefile'
1227 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1228 echo ' (default: $(INSTALL_HDR_PATH))'; \
1229 echo ''
1230 @echo 'Static analysers'
1231 @echo ' checkstack - Generate a list of stack hogs'
1232 @echo ' namespacecheck - Name space analysis on compiled kernel'
1233 @echo ' versioncheck - Sanity check on version.h usage'
1234 @echo ' includecheck - Check for duplicate included header files'
1235 @echo ' export_report - List the usages of all exported symbols'
1236 @echo ' headers_check - Sanity check on exported headers'
1237 @echo ' headerdep - Detect inclusion cycles in headers'
1238 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1239 @echo ''
1240 @echo 'Kernel packaging:'
1241 @$(MAKE) $(build)=$(package-dir) help
1242 @echo ''
1243 @echo 'Documentation targets:'
1244 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1245 @echo ''
1246 @echo 'Architecture specific targets ($(SRCARCH)):'
1247 @$(if $(archhelp),$(archhelp),\
1248 echo ' No architecture specific help defined for $(SRCARCH)')
1249 @echo ''
1250 @$(if $(boards), \
1251 $(foreach b, $(boards), \
1252 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1253 echo '')
1254 @$(if $(board-dirs), \
1255 $(foreach b, $(board-dirs), \
1256 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1257 printf " %-16s - Show all of the above\\n" help-boards; \
1258 echo '')
1260 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1261 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1262 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1263 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1264 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1265 @echo ''
1266 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1267 @echo 'For further info see the ./README file'
1270 help-board-dirs := $(addprefix help-,$(board-dirs))
1272 help-boards: $(help-board-dirs)
1274 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1276 $(help-board-dirs): help-%:
1277 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1278 @$(if $(boards-per-dir), \
1279 $(foreach b, $(boards-per-dir), \
1280 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1281 echo '')
1284 # Documentation targets
1285 # ---------------------------------------------------------------------------
1286 %docs: scripts_basic FORCE
1287 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1289 else # KBUILD_EXTMOD
1292 # External module support.
1293 # When building external modules the kernel used as basis is considered
1294 # read-only, and no consistency checks are made and the make
1295 # system is not used on the basis kernel. If updates are required
1296 # in the basis kernel ordinary make commands (without M=...) must
1297 # be used.
1299 # The following are the only valid targets when building external
1300 # modules.
1301 # make M=dir clean Delete all automatically generated files
1302 # make M=dir modules Make all modules in specified dir
1303 # make M=dir Same as 'make M=dir modules'
1304 # make M=dir modules_install
1305 # Install the modules built in the module directory
1306 # Assumes install directory is already created
1308 # We are always building modules
1309 KBUILD_MODULES := 1
1310 PHONY += crmodverdir
1311 crmodverdir:
1312 $(cmd_crmodverdir)
1314 PHONY += $(objtree)/Module.symvers
1315 $(objtree)/Module.symvers:
1316 @test -e $(objtree)/Module.symvers || ( \
1317 echo; \
1318 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1319 echo " is missing; modules will have no dependencies and modversions."; \
1320 echo )
1322 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1323 PHONY += $(module-dirs) modules
1324 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1325 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1327 modules: $(module-dirs)
1328 @$(kecho) ' Building modules, stage 2.';
1329 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1331 PHONY += modules_install
1332 modules_install: _emodinst_ _emodinst_post
1334 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1335 PHONY += _emodinst_
1336 _emodinst_:
1337 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1338 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1340 PHONY += _emodinst_post
1341 _emodinst_post: _emodinst_
1342 $(call cmd,depmod)
1344 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1346 PHONY += $(clean-dirs) clean
1347 $(clean-dirs):
1348 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1350 clean: rm-dirs := $(MODVERDIR)
1351 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1353 help:
1354 @echo ' Building external modules.'
1355 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1356 @echo ''
1357 @echo ' modules - default target, build the module(s)'
1358 @echo ' modules_install - install the module'
1359 @echo ' clean - remove generated files in module directory only'
1360 @echo ''
1362 # Dummies...
1363 PHONY += prepare scripts
1364 prepare: ;
1365 scripts: ;
1366 endif # KBUILD_EXTMOD
1368 clean: $(clean-dirs)
1369 $(call cmd,rmdirs)
1370 $(call cmd,rmfiles)
1371 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1372 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1373 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1374 -o -name '*.symtypes' -o -name 'modules.order' \
1375 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1376 -o -name '*.gcno' \) -type f -print | xargs rm -f
1378 # Generate tags for editors
1379 # ---------------------------------------------------------------------------
1380 quiet_cmd_tags = GEN $@
1381 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1383 tags TAGS cscope: FORCE
1384 $(call cmd,tags)
1386 # Scripts to check various things for consistency
1387 # ---------------------------------------------------------------------------
1389 includecheck:
1390 find * $(RCS_FIND_IGNORE) \
1391 -name '*.[hcS]' -type f -print | sort \
1392 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1394 versioncheck:
1395 find * $(RCS_FIND_IGNORE) \
1396 -name '*.[hcS]' -type f -print | sort \
1397 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1399 coccicheck:
1400 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1402 namespacecheck:
1403 $(PERL) $(srctree)/scripts/namespace.pl
1405 export_report:
1406 $(PERL) $(srctree)/scripts/export_report.pl
1408 endif #ifeq ($(config-targets),1)
1409 endif #ifeq ($(mixed-targets),1)
1411 PHONY += checkstack kernelrelease kernelversion
1413 # UML needs a little special treatment here. It wants to use the host
1414 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1415 # else wants $(ARCH), including people doing cross-builds, which means
1416 # that $(SUBARCH) doesn't work here.
1417 ifeq ($(ARCH), um)
1418 CHECKSTACK_ARCH := $(SUBARCH)
1419 else
1420 CHECKSTACK_ARCH := $(ARCH)
1421 endif
1422 checkstack:
1423 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1424 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1426 kernelrelease:
1427 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1429 kernelversion:
1430 @echo $(KERNELVERSION)
1432 # Single targets
1433 # ---------------------------------------------------------------------------
1434 # Single targets are compatible with:
1435 # - build with mixed source and output
1436 # - build with separate output dir 'make O=...'
1437 # - external modules
1439 # target-dir => where to store outputfile
1440 # build-dir => directory in kernel source tree to use
1442 ifeq ($(KBUILD_EXTMOD),)
1443 build-dir = $(patsubst %/,%,$(dir $@))
1444 target-dir = $(dir $@)
1445 else
1446 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1447 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1448 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1449 endif
1451 %.s: %.c prepare scripts FORCE
1452 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1453 %.i: %.c prepare scripts FORCE
1454 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1455 %.o: %.c prepare scripts FORCE
1456 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1457 %.lst: %.c prepare scripts FORCE
1458 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1459 %.s: %.S prepare scripts FORCE
1460 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1461 %.o: %.S prepare scripts FORCE
1462 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1463 %.symtypes: %.c prepare scripts FORCE
1464 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1466 # Modules
1467 /: prepare scripts FORCE
1468 $(cmd_crmodverdir)
1469 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1470 $(build)=$(build-dir)
1471 %/: prepare scripts FORCE
1472 $(cmd_crmodverdir)
1473 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1474 $(build)=$(build-dir)
1475 %.ko: prepare scripts FORCE
1476 $(cmd_crmodverdir)
1477 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1478 $(build)=$(build-dir) $(@:.ko=.o)
1479 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1481 # FIXME Should go into a make.lib or something
1482 # ===========================================================================
1484 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1485 cmd_rmdirs = rm -rf $(rm-dirs)
1487 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1488 cmd_rmfiles = rm -f $(rm-files)
1490 # Run depmod only if we have System.map and depmod is executable
1491 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1492 cmd_depmod = \
1493 if [ -r System.map -a -x $(DEPMOD) ]; then \
1494 $(DEPMOD) -ae -F System.map \
1495 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1496 $(KERNELRELEASE); \
1499 # Create temporary dir for module support files
1500 # clean it up only when building all modules
1501 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1502 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1504 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1505 $(KBUILD_AFLAGS_KERNEL) \
1506 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1507 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1509 quiet_cmd_as_o_S = AS $@
1510 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1512 # read all saved command lines
1514 targets := $(wildcard $(sort $(targets)))
1515 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1517 ifneq ($(cmd_files),)
1518 $(cmd_files): ; # Do not try to update included dependency files
1519 include $(cmd_files)
1520 endif
1522 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1523 # Usage:
1524 # $(Q)$(MAKE) $(clean)=dir
1525 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1527 endif # skip-makefile
1529 PHONY += FORCE
1530 FORCE:
1532 # Declare the contents of the .PHONY variable as phony. We keep that
1533 # information in a variable so we can use it in if_changed and friends.
1534 .PHONY: $(PHONY)