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 print "Entering directory ..."
14 MAKEFLAGS
+= --no-print-directory
16 # We are using a recursive build, so we need to do a little thinking
17 # to get the ordering right.
19 # Most importantly: sub-Makefiles should only ever modify files in
20 # their own directory. If in some directory we have a dependency on
21 # a file in another dir (which doesn't happen often, but it's of
22 # unavoidable when linking the built-in.o targets which finally
23 # turn into vmlinux), we will call a sub make in that other dir, and
24 # after that we are sure that everything which is in that other dir
27 # The only cases where we need to modify files which have global
28 # effects are thus separated out and done before the recursive
29 # descending is started. They are now explicitly listed as the
32 # To put more focus on warnings, be less verbose as default
33 # Use 'make V=1' to see the full commands
36 ifeq ("$(origin V)", "command line")
44 # Call sparse as part of compilation of C files
45 # Use 'make C=1' to enable sparse checking
48 ifeq ("$(origin C)", "command line")
49 KBUILD_CHECKSRC
= $(C
)
52 ifndef KBUILD_CHECKSRC
56 # Use make M=dir to specify direcotry of external module to build
57 # Old syntax make ... SUBDIRS=$PWD is still supported
58 # Setting the environment variable KBUILD_EXTMOD take precedence
60 KBUILD_EXTMOD ?
= $(SUBDIRS
)
63 ifeq ("$(origin M)", "command line")
69 # kbuild supports saving output files in a separate directory.
70 # To locate output files in a separate directory two syntax'es are supported.
71 # In both cases the working directory must be the root of the kernel src.
73 # Use "make O=dir/to/store/output/files/"
75 # 2) Set KBUILD_OUTPUT
76 # Set the environment variable KBUILD_OUTPUT to point to the directory
77 # where the output files shall be placed.
78 # export KBUILD_OUTPUT=dir/to/store/output/files/
81 # The O= assigment takes precedence over the KBUILD_OUTPUT environment variable.
84 # KBUILD_SRC is set on invocation of make in OBJ directory
85 # KBUILD_SRC is not intended to be used by the regular user (for now)
88 # OK, Make called in directory where kernel src resides
89 # Do we want to locate output files in a separate directory?
91 ifeq ("$(origin O)", "command line")
96 # That's our default target when none is given on the command line
100 ifneq ($(KBUILD_OUTPUT
),)
101 # Invoke a second make in the output directory, passing relevant variables
102 # check that the output directory actually exists
103 saved-output
:= $(KBUILD_OUTPUT
)
104 KBUILD_OUTPUT
:= $(shell cd
$(KBUILD_OUTPUT
) && /bin
/pwd
)
105 $(if
$(wildcard $(KBUILD_OUTPUT
)),, \
106 $(error output directory
"$(saved-output)" does not exist
))
108 .PHONY
: $(MAKECMDGOALS
)
110 $(filter-out _all
,$(MAKECMDGOALS
)) _all
:
111 $(if
$(KBUILD_VERBOSE
:1=),@
)$(MAKE
) -C
$(KBUILD_OUTPUT
) \
112 KBUILD_SRC
=$(CURDIR
) KBUILD_VERBOSE
=$(KBUILD_VERBOSE
) \
113 KBUILD_CHECK
=$(KBUILD_CHECK
) KBUILD_EXTMOD
="$(KBUILD_EXTMOD)" \
114 -f
$(CURDIR
)/Makefile
$@
116 # Leave processing to above invocation of make
118 endif # ifneq ($(KBUILD_OUTPUT),)
119 endif # ifeq ($(KBUILD_SRC),)
121 # We process the rest of the Makefile if this is the final invocation of make
122 ifeq ($(skip-makefile
),)
124 # If building an external module we do not care about the all: rule
125 # but instead _all depend on modules
127 ifeq ($(KBUILD_EXTMOD
),)
133 # Make sure we're not wasting cpu-cycles doing locale handling, yet do make
134 # sure error messages appear in the user-desired language
141 export LANG LC_ALL LC_COLLATE LC_CTYPE
143 srctree
:= $(if
$(KBUILD_SRC
),$(KBUILD_SRC
),$(CURDIR
))
145 # FIXME - TOPDIR is obsolete, use srctree/objtree
152 export srctree objtree VPATH TOPDIR
154 KERNELRELEASE
=$(VERSION
).
$(PATCHLEVEL
).
$(SUBLEVEL
)$(EXTRAVERSION
)
156 # SUBARCH tells the usermode build what the underlying arch is. That is set
157 # first, and if a usermode build is happening, the "ARCH=um" on the command
158 # line overrides the setting of ARCH below. If a native build is happening,
159 # then ARCH is assigned, getting whatever value it gets normally, and
160 # SUBARCH is subsequently ignored.
162 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/i386
/ -e s
/sun4u
/sparc64
/ \
163 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
164 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ )
166 # Cross compiling and selecting different set of gcc/bin-utils
167 # ---------------------------------------------------------------------------
169 # When performing cross compilation for other architectures ARCH shall be set
170 # to the target architecture. (See arch/* for the possibilities).
171 # ARCH can be set during invocation of make:
173 # Another way is to have ARCH set in the environment.
174 # The default ARCH is the host where make is executed.
176 # CROSS_COMPILE specify the prefix used for all executables used
177 # during compilation. Only gcc and related bin-utils executables
178 # are prefixed with $(CROSS_COMPILE).
179 # CROSS_COMPILE can be set on the command line
180 # make CROSS_COMPILE=ia64-linux-
181 # Alternatively CROSS_COMPILE can be set in the environment.
182 # Default value for CROSS_COMPILE is not to prefix executables
183 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
188 # Architecture as present in compile.h
189 UTS_MACHINE
:= $(ARCH
)
191 # SHELL used by kbuild
192 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
193 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
194 else echo sh
; fi
; fi
)
198 HOSTCFLAGS
= -Wall
-Wstrict-prototypes
-O2
-fomit-frame-pointer
201 # Decide whether to build built-in, modular, or both.
202 # Normally, just do built-in.
207 # If we have only "make modules", don't compile built-in objects.
208 # When we're building modules with modversions, we need to consider
209 # the built-in objects during the descend as well, in order to
210 # make sure the checksums are uptodate before we record them.
212 ifeq ($(MAKECMDGOALS
),modules
)
213 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
216 # If we have "make <whatever> modules", compile modules
217 # in addition to whatever we do anyway.
218 # Just "make" or "make all" shall build modules as well
220 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
224 ifeq ($(MAKECMDGOALS
),)
228 export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE
229 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
232 # ---------------------------------------------------------------------------
234 # Normally, we echo the whole command before executing it. By making
235 # that echo $($(quiet)$(cmd)), we now have the possibility to set
236 # $(quiet) to choose other forms of output instead, e.g.
238 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
239 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
241 # If $(quiet) is empty, the whole command will be printed.
242 # If it is set to "quiet_", only the short version will be printed.
243 # If it is set to "silent_", nothing wil be printed at all, since
244 # the variable $(silent_cmd_cc_o_c) doesn't exist.
246 # A simple variant is to prefix commands with $(Q) - that's usefull
247 # for commands that shall be hidden in non-verbose mode.
251 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
252 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
254 ifeq ($(KBUILD_VERBOSE
),1)
262 # If the user is running make -s (silent mode), suppress echoing of
265 ifneq ($(findstring s
,$(MAKEFLAGS
)),)
269 check_gcc
= $(shell if
$(CC
) $(CFLAGS
) $(1) -S
-o
/dev
/null
-xc
/dev
/null
> /dev
/null
2>&1; then echo
"$(1)"; else echo
"$(2)"; fi
;)
271 export quiet Q KBUILD_VERBOSE check_gcc
273 # Look for make include files relative to root of kernel src
274 MAKEFLAGS
+= --include-dir
=$(srctree
)
276 # For maximum performance (+ possibly random breakage, uncomment
281 # Make variables (CC, etc...)
283 AS
= $(CROSS_COMPILE
)as
284 LD
= $(CROSS_COMPILE
)ld
285 CC
= $(CROSS_COMPILE
)gcc
287 AR
= $(CROSS_COMPILE
)ar
288 NM
= $(CROSS_COMPILE
)nm
289 STRIP
= $(CROSS_COMPILE
)strip
290 OBJCOPY
= $(CROSS_COMPILE
)objcopy
291 OBJDUMP
= $(CROSS_COMPILE
)objdump
293 RPM
:= $(shell if
[ -x
"/usr/bin/rpmbuild" ]; then echo rpmbuild
; \
295 GENKSYMS
= scripts
/genksyms
/genksyms
296 DEPMOD
= /sbin
/depmod
297 KALLSYMS
= scripts
/kallsyms
301 CFLAGS_MODULE
= $(MODFLAGS
)
302 AFLAGS_MODULE
= $(MODFLAGS
)
307 NOSTDINC_FLAGS
= -nostdinc
-iwithprefix
include
309 CPPFLAGS
:= -D__KERNEL__
-Iinclude \
310 $(if
$(KBUILD_SRC
),-Iinclude2
-I
$(srctree
)/include)
312 CFLAGS
:= -Wall
-Wstrict-prototypes
-Wno-trigraphs \
313 -fno-strict-aliasing
-fno-common
314 AFLAGS
:= -D__ASSEMBLY__
316 export VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION KERNELRELEASE ARCH \
317 CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
318 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
319 HOSTCXX HOSTCXXFLAGS LDFLAGS_BLOB LDFLAGS_MODULE CHECK
321 export CPPFLAGS NOSTDINC_FLAGS OBJCOPYFLAGS LDFLAGS
322 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
323 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
325 # When compiling out-of-tree modules, put MODVERDIR in the module
326 # tree rather than in the kernel tree. The kernel tree might
328 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
330 # The temporary file to save gcc -MD generated dependencies must not
333 depfile
= $(subst $(comma
),_
,$(@D
)/.
$(@F
).d
)
335 # Files to ignore in find ... statements
337 RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o
-name CVS \
) -prune
-o
338 RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn
--exclude CVS
340 # ===========================================================================
341 # Rules shared between *config targets and build targets
343 # Basic helpers built in scripts/
344 .PHONY
: scripts_basic
346 $(Q
)$(MAKE
) $(build
)=scripts
/basic
348 # To make sure we do not include .config for any of the *config targets
349 # catch them early, and hand them over to scripts/kconfig/Makefile
350 # It is allowed to specify more targets when calling make, including
351 # mixing *config targets and build targets.
352 # For example 'make oldconfig all'.
353 # Detect when mixed targets is specified, and make a second invocation
354 # of make so .config is not included in this case either (for *config).
356 no-dot-config-targets
:= clean mrproper
distclean \
357 cscope TAGS
tags help
%docs
check%
363 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
364 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
369 ifeq ($(KBUILD_EXTMOD
),)
370 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
372 ifneq ($(filter-out config
%config
,$(MAKECMDGOALS
)),)
378 ifeq ($(mixed-targets
),1)
379 # ===========================================================================
380 # We're called with mixed targets (*config and build targets).
381 # Handle them one by one.
384 $(Q
)$(MAKE
) -C
$(srctree
) KBUILD_SRC
= $@
387 ifeq ($(config-targets
),1)
388 # ===========================================================================
389 # *config targets only - make sure prerequisites are updated, and descend
390 # in scripts/kconfig to make the *config target
392 config
: scripts_basic FORCE
393 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
394 %config
: scripts_basic FORCE
395 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
398 # ===========================================================================
399 # Build targets only - this includes vmlinux, arch specific targets, clean
400 # targets and others. In general all targets except *config targets.
402 ifeq ($(KBUILD_EXTMOD
),)
403 # Additional helpers built in scripts/
404 # Carefully list dependencies so we do not try to build scripts twice
407 scripts
: scripts_basic
include/config
/MARKER
408 $(Q
)$(MAKE
) $(build
)=$(@
)
410 scripts_basic
: include/linux
/autoconf.h
413 # That's our default target when none is given on the command line
414 # Note that 'modules' will be added as a prerequisite as well,
415 # in the CONFIG_MODULES part below
419 # Objects we will link into vmlinux / subdirs we need to visit
421 drivers-y
:= drivers
/ sound
/
425 endif # KBUILD_EXTMOD
427 ifeq ($(dot-config
),1)
428 # In this section, we need .config
430 # Read in dependencies to all Kconfig* files, make sure to run
431 # oldconfig if changes are detected.
436 # If .config needs to be updated, it will be done via the dependency
437 # that autoconf has on .config.
438 # To avoid any implicit rule to kick in, define an empty command
441 # If .config is newer than include/linux/autoconf.h, someone tinkered
442 # with it and forgot to run make oldconfig
443 include/linux
/autoconf.h
: .config
444 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
446 # Dummy target needed, because used as prerequisite
447 include/linux
/autoconf.h
: ;
450 include $(srctree
)/arch
/$(ARCH
)/Makefile
452 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
458 ifndef CONFIG_FRAME_POINTER
459 CFLAGS
+= -fomit-frame-pointer
462 ifdef CONFIG_DEBUG_INFO
466 # warn about C99 declaration after statement
467 CFLAGS
+= $(call check_gcc
,-Wdeclaration-after-statement
,)
470 # INSTALL_PATH specifies where to place the updated kernel and system map
471 # images. Uncomment if you want to place them anywhere other than root.
474 #export INSTALL_PATH=/boot
477 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
478 # relocations required by build roots. This is not defined in the
479 # makefile but the arguement can be passed to make if needed.
482 MODLIB
:= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
486 ifeq ($(KBUILD_EXTMOD
),)
487 core-y
+= kernel
/ mm
/ fs
/ ipc
/ security
/ crypto
/
489 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
490 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
491 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
)))
493 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
495 $(core-n
) $(core-
) $(drivers-n
) $(drivers-
) \
496 $(net-n
) $(net-
) $(libs-n
) $(libs-
))))
498 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
499 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
500 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
501 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
502 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
503 libs-y2
:= $(patsubst %/, %/built-in.o
, $(libs-y
))
504 libs-y
:= $(libs-y1
) $(libs-y2
)
507 # ---------------------------------------------------------------------------
509 # This is a bit tricky: If we need to relink vmlinux, we want
510 # the version number incremented, which means recompile init/version.o
511 # and relink init/init.o. However, we cannot do this during the
512 # normal descending-into-subdirs phase, since at that time
513 # we cannot yet know if we will need to relink vmlinux.
514 # So we descend into init/ inside the rule for vmlinux again.
516 vmlinux-objs
:= $(head-y
) $(init-y
) $(core-y
) $(libs-y
) $(drivers-y
) $(net-y
)
518 quiet_cmd_vmlinux__
= LD
$@
520 $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) $(head-y
) $(init-y
) \
527 $(filter .tmp_kallsyms
%,$^
) \
531 # set -e makes the rule exit immediately on error
533 define rule_vmlinux__
535 $(if
$(filter .tmp_kallsyms
%,$^
),, \
536 echo
' GEN .version'; \
537 .
$(srctree
)/scripts
/mkversion
> .tmp_version
; \
538 mv
-f .tmp_version .version
; \
539 $(MAKE
) $(build
)=init
; \
541 $(if
$($(quiet
)cmd_vmlinux__
), \
542 echo
' $($(quiet)cmd_vmlinux__)' &&) \
544 echo
'cmd_$@ := $(cmd_vmlinux__)' > $(@D
)/.
$(@F
).cmd
549 $(NM
) $@ | grep
-v
'\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' |
sort > System.map
552 LDFLAGS_vmlinux
+= -T arch
/$(ARCH
)/kernel
/vmlinux.lds.s
554 # Generate section listing all symbols and add it into vmlinux
555 # It's a three stage process:
556 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
558 # Running kallsyms on that gives us .tmp_kallsyms1.o with
560 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
561 # but due to the added section, some addresses have shifted
562 # From here, we generate a correct .tmp_kallsyms2.o
563 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
565 ifdef CONFIG_KALLSYMS
567 kallsyms.o
:= .tmp_kallsyms2.o
569 quiet_cmd_kallsyms
= KSYM
$@
570 cmd_kallsyms
= $(NM
) -n
$< |
$(KALLSYMS
) $(foreach x
,$(CONFIG_KALLSYMS_ALL
),--all-symbols
) > $@
572 .tmp_kallsyms1.o .tmp_kallsyms2.o
: %.o
: %.S scripts FORCE
573 $(call if_changed_dep
,as_o_S
)
575 .tmp_kallsyms
%.S
: .tmp_vmlinux
%
578 .tmp_vmlinux1
: $(vmlinux-objs
) arch
/$(ARCH
)/kernel
/vmlinux.lds.s FORCE
579 +$(call if_changed_rule
,vmlinux__
)
581 .tmp_vmlinux2
: $(vmlinux-objs
) .tmp_kallsyms1.o arch
/$(ARCH
)/kernel
/vmlinux.lds.s FORCE
582 $(call if_changed_rule
,vmlinux__
)
586 # Finally the vmlinux rule
588 vmlinux
: $(vmlinux-objs
) $(kallsyms.o
) arch
/$(ARCH
)/kernel
/vmlinux.lds.s FORCE
589 $(call if_changed_rule
,vmlinux
)
591 # The actual objects are generated when descending,
592 # make sure no implicit rule kicks in
594 $(sort $(vmlinux-objs
)) arch
/$(ARCH
)/kernel
/vmlinux.lds.s
: $(vmlinux-dirs
) ;
596 # Handle descending into subdirectories listed in $(vmlinux-dirs)
598 .PHONY
: $(vmlinux-dirs
)
599 $(vmlinux-dirs
): prepare-all scripts
600 $(Q
)$(MAKE
) $(build
)=$@
602 # Things we need to do before we recursively start building the kernel
603 # or the modules are listed in "prepare-all".
604 # A multi level approach is used. prepare1 is updated first, then prepare0.
605 # prepare-all is the collection point for the prepare targets.
607 .PHONY
: prepare-all prepare prepare0 prepare1
609 # prepare1 is used to check if we are building in a separate output directory,
611 # 1) Check that make has not been executed in the kernel src $(srctree)
612 # 2) Create the include2 directory, used for the second asm symlink
615 ifneq ($(KBUILD_SRC
),)
616 @echo
' Using $(srctree) as source for kernel'
617 $(Q
)if
[ -h
$(srctree
)/include/asm
-o
-f
$(srctree
)/.config
]; then \
618 echo
" $(srctree) is not clean, please run 'make mrproper'";\
619 echo
" in the '$(srctree)' directory.";\
622 $(Q
)if
[ ! -d include2
]; then mkdir
-p include2
; fi
;
623 $(Q
)ln
-fsn
$(srctree
)/include/asm-
$(ARCH
) include2
/asm
626 prepare0
: prepare1
include/linux
/version.h
include/asm
include/config
/MARKER
627 ifneq ($(KBUILD_MODULES
),)
628 $(Q
)rm -rf
$(MODVERDIR
)
629 $(Q
)mkdir
-p
$(MODVERDIR
)
632 # All the preparing..
633 prepare-all
: prepare0 prepare
635 # Leave this as default for preprocessing vmlinux.lds.S, which is now
636 # done in arch/$(ARCH)/kernel/Makefile
638 export AFLAGS_vmlinux.lds.o
+= -P
-C
-U
$(ARCH
)
641 # ---------------------------------------------------------------------------
643 %.s
: %.c scripts FORCE
644 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
645 %.i
: %.c scripts FORCE
646 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
647 %.o
: %.c scripts FORCE
648 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
649 %/: scripts prepare FORCE
650 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) $(build
)=$(@D
)
651 %.lst
: %.c scripts FORCE
652 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
653 %.s
: %.S scripts FORCE
654 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
655 %.o
: %.S scripts FORCE
656 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
658 # FIXME: The asm symlink changes when $(ARCH) changes. That's
659 # hard to detect, but I suppose "make mrproper" is a good idea
660 # before switching between archs anyway.
663 @echo
' SYMLINK $@ -> include/asm-$(ARCH)'
664 $(Q
)if
[ ! -d
include ]; then mkdir
-p
include; fi
;
665 @ln
-fsn asm-
$(ARCH
) $@
667 # Split autoconf.h into include/linux/config/*
669 include/config
/MARKER
: include/linux
/autoconf.h
670 @echo
' SPLIT include/linux/autoconf.h -> include/config/*'
671 @scripts
/basic
/split-include
include/linux
/autoconf.h
include/config
674 # Generate some files
675 # ---------------------------------------------------------------------------
677 # version.h changes when $(KERNELRELEASE) etc change, as defined in
682 define filechk_version.h
683 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
684 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
687 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
688 echo \
#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
689 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
693 include/linux
/version.h
: Makefile
694 $(call filechk
,version.h
)
696 # ---------------------------------------------------------------------------
700 @echo
'*** Warning: make $@ is unnecessary now.'
702 # ---------------------------------------------------------------------------
707 # By default, build modules as well
714 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
)
715 @echo
' Building modules, stage 2.';
716 $(Q
)$(MAKE
) -rR
-f
$(srctree
)/scripts
/Makefile.modpost
719 # Target to prepare building external modules
720 .PHONY
: modules_prepare
721 modules_prepare
: prepare-all scripts
723 # Target to install modules
724 .PHONY
: modules_install
725 modules_install
: _modinst_ _modinst_post
729 @if
[ -z
"`$(DEPMOD) -V | grep module-init-tools`" ]; then \
730 echo
"Warning: you may need to install module-init-tools"; \
731 echo
"See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
734 @
rm -rf
$(MODLIB
)/kernel
735 @
rm -f
$(MODLIB
)/build
736 @mkdir
-p
$(MODLIB
)/kernel
737 @ln
-s
$(TOPDIR
) $(MODLIB
)/build
738 $(Q
)$(MAKE
) -rR
-f
$(srctree
)/scripts
/Makefile.modinst
740 # If System.map exists, run depmod. This deliberately does not have a
741 # dependency on System.map since that would run the dependency tree on
742 # vmlinux. This depmod is only for convenience to give the initial
743 # boot a modules.dep even before / is mounted read-write. However the
744 # boot script depmod is the master version.
745 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
748 depmod_opts
:= -b
$(INSTALL_MOD_PATH
) -r
750 .PHONY
: _modinst_post
751 _modinst_post
: _modinst_
752 if
[ -r System.map
]; then
$(DEPMOD
) -ae
-F System.map
$(depmod_opts
) $(KERNELRELEASE
); fi
754 else # CONFIG_MODULES
756 # Modules not configured
757 # ---------------------------------------------------------------------------
759 modules modules_install
: FORCE
761 @echo
"The present kernel configuration has modules disabled."
762 @echo
"Type 'make config' and enable loadable module support."
763 @echo
"Then build a kernel with module support enabled."
767 endif # CONFIG_MODULES
769 # Generate asm-offsets.h
770 # ---------------------------------------------------------------------------
772 define filechk_gen-asm-offsets
774 echo
"#ifndef __ASM_OFFSETS_H__"; \
775 echo
"#define __ASM_OFFSETS_H__"; \
777 echo
" * DO NOT MODIFY."; \
779 echo
" * This file was generated by arch/$(ARCH)/Makefile"; \
783 sed
-ne
"/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
790 # Cleaning is done on three levels.
791 # make clean Delete most generated files
792 # Leave enough to build external modules
793 # make mrproper Delete the current configuration, and all generated files
794 # make distclean Remove editor backup files, patch leftover files and the like
796 # Directories & files removed with 'make clean'
797 CLEAN_DIRS
+= $(MODVERDIR
)
798 CLEAN_FILES
+= vmlinux System.map kernel.spec \
799 .tmp_kallsyms
* .tmp_version .tmp_vmlinux
*
801 # Directories & files removed with 'make mrproper'
802 MRPROPER_DIRS
+= include/config include2
803 MRPROPER_FILES
+= .config .config.old
include/asm .version \
804 include/linux
/autoconf.h
include/linux
/version.h \
805 Module.symvers
tags TAGS cscope
*
807 # clean - Delete most, but leave enough to build external modules
809 clean: rm-dirs
:= $(CLEAN_DIRS
)
810 clean: rm-files
:= $(CLEAN_FILES
)
811 clean-dirs
:= $(addprefix _clean_
,$(vmlinux-alldirs
))
813 .PHONY
: $(clean-dirs
) clean archclean
815 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
817 clean: archclean
$(clean-dirs
)
820 @find .
$(RCS_FIND_IGNORE
) \
821 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
822 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
) \
823 -type f
-print | xargs
rm -f
825 # mrproper - Delete all generated files, including .config
827 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
828 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
829 mrproper-dirs
:= $(addprefix _mrproper_
,Documentation
/DocBook scripts
)
831 .PHONY
: $(mrproper-dirs
) mrproper archmrproper
833 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
835 mrproper
: clean archmrproper
$(mrproper-dirs
)
844 @find .
$(RCS_FIND_IGNORE
) \
845 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
846 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'.*.orig' \
847 -o
-name
'.*.rej' -o
-size
0 \
848 -o
-name
'*%' -o
-name
'.*.cmd' -o
-name
'core' \
) \
849 -type f
-print | xargs
rm -f
852 # ---------------------------------------------------------------------------
856 # Remove hyphens since they have special meaning in RPM filenames
857 KERNELPATH
=kernel-
$(subst -,,$(KERNELRELEASE
))
859 # If you do a make spec before packing the tarball you can rpm -ta it
862 $(CONFIG_SHELL
) $(srctree
)/scripts
/mkspec
> $(objtree
)/kernel.spec
864 # a) Build a tar ball
865 # b) generate an rpm from it
866 # c) and pack the result
867 # - Use /. to avoid tar packing just the symlink
872 ln
-sf
$(srctree
) $(KERNELPATH
) ; \
873 tar -cvz
$(RCS_TAR_IGNORE
) -f
$(KERNELPATH
).
tar.gz
$(KERNELPATH
)/.
; \
877 $(CONFIG_SHELL
) $(srctree
)/scripts
/mkversion
> $(objtree
)/.tmp_version
;\
878 mv
-f
$(objtree
)/.tmp_version
$(objtree
)/.version
;
880 $(RPM
) --target
$(UTS_MACHINE
) -ta ..
/$(KERNELPATH
).
tar.gz
881 rm ..
/$(KERNELPATH
).
tar.gz
883 # Brief documentation of the typical targets used
884 # ---------------------------------------------------------------------------
886 boards
:= $(wildcard $(srctree
)/arch
/$(ARCH
)/configs
/*_defconfig
)
887 boards
:= $(notdir $(boards
))
890 @echo
'Cleaning targets:'
891 @echo
' clean - remove most generated files but keep the config'
892 @echo
' mrproper - remove all generated files + config + various backup files'
894 @echo
'Configuration targets:'
895 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
897 @echo
'Other generic targets:'
898 @echo
' all - Build all targets marked with [*]'
899 @echo
'* vmlinux - Build the bare kernel'
900 @echo
'* modules - Build all modules'
901 @echo
' modules_install - Install all modules'
902 @echo
' dir/ - Build all files in dir and below'
903 @echo
' dir/file.[ois] - Build specified target only'
904 @echo
' rpm - Build a kernel as an RPM package'
905 @echo
' tags/TAGS - Generate tags file for editors'
906 @echo
' cscope - Generate cscope index'
908 @echo
'Documentation targets:'
909 @
$(MAKE
) -f
$(srctree
)/Documentation
/DocBook
/Makefile dochelp
911 @echo
'Architecture specific targets ($(ARCH)):'
912 @
$(if
$(archhelp
),$(archhelp
),\
913 echo
' No architecture specific help defined for $(ARCH)')
916 $(foreach b
, $(boards
), \
917 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
920 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
921 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
922 @echo
' make C=1 [targets] Check all c source with checker tool'
924 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
925 @echo
'For further info see the ./README file'
928 # Documentation targets
929 # ---------------------------------------------------------------------------
930 %docs
: scripts_basic FORCE
931 $(Q
)$(MAKE
) $(build
)=Documentation
/DocBook
$@
936 # External module support.
937 # When building external modules the kernel used as basis is considered
938 # read-only, and no consistency checks are made and the make
939 # system is not used on the basis kernel. If updates are required
940 # in the basis kernel ordinary make commands (without M=...) must
943 # The following are the only valid targets when building external
945 # make M=dir clean Delete all automatically generated files
946 # make M=dir modules Make all modules in specified dir
947 # make M=dir Same as 'make M=dir modules'
948 # make M=dir modules_install
949 # Install the modules build in the module directory
950 # Assumes install directory is already created
952 # We are always building modules
956 $(Q
)mkdir
-p
$(MODVERDIR
)
958 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
959 .PHONY
: $(module-dirs
) modules
960 $(module-dirs
): crmodverdir
961 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
963 modules
: $(module-dirs
)
964 @echo
' Building modules, stage 2.';
965 $(Q
)$(MAKE
) -rR
-f
$(srctree
)/scripts
/Makefile.modpost
967 .PHONY
: modules_install
969 $(Q
)$(MAKE
) -rR
-f
$(srctree
)/scripts
/Makefile.modinst
971 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
973 .PHONY
: $(clean-dirs
) clean
975 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
977 clean: rm-dirs
:= $(MODVERDIR
)
980 @find
$(KBUILD_EXTMOD
) $(RCS_FIND_IGNORE
) \
981 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
982 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
) \
983 -type f
-print | xargs
rm -f
986 @echo
' Building external modules.'
987 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
989 @echo
' modules - default target, build the module(s)'
990 @echo
' modules_install - install the module'
991 @echo
' clean - remove generated files in module directory only'
993 endif # KBUILD_EXTMOD
995 # Generate tags for editors
996 # ---------------------------------------------------------------------------
999 ( find .
$(RCS_FIND_IGNORE
) \
1000 \
( -name
include -o
-name arch \
) -prune
-o \
1001 -name
'*.[chS]' -print; \
1002 find arch
/$(ARCH
) $(RCS_FIND_IGNORE
) \
1003 -name
'*.[chS]' -print; \
1004 find security
/selinux
/include $(RCS_FIND_IGNORE
) \
1005 -name
'*.[chS]' -print; \
1006 find
include $(RCS_FIND_IGNORE
) \
1007 \
( -name config
-o
-name
'asm-*' \
) -prune \
1008 -o
-name
'*.[chS]' -print; \
1009 find
include/asm-
$(ARCH
) $(RCS_FIND_IGNORE
) \
1010 -name
'*.[chS]' -print; \
1011 find
include/asm-generic
$(RCS_FIND_IGNORE
) \
1012 -name
'*.[chS]' -print )
1015 quiet_cmd_cscope-file
= FILELST cscope.files
1016 cmd_cscope-file
= $(all-sources
) > cscope.files
1018 quiet_cmd_cscope
= MAKE cscope.out
1019 cmd_cscope
= cscope
-k
-b
-q
1022 $(call cmd
,cscope-file
)
1025 quiet_cmd_TAGS
= MAKE
$@
1026 cmd_TAGS
= $(all-sources
) | etags
-
1028 # Exuberant ctags works better with -I
1030 quiet_cmd_tags
= MAKE
$@
1033 CTAGSF
=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_NOVERS"`; \
1034 $(all-sources
) | xargs ctags
$$CTAGSF -a
1044 # Scripts to check various things for consistency
1045 # ---------------------------------------------------------------------------
1048 find
* $(RCS_FIND_IGNORE
) \
1049 -name
'*.[hcS]' -type f
-print |
sort \
1050 | xargs
$(PERL
) -w scripts
/checkconfig.pl
1053 find
* $(RCS_FIND_IGNORE
) \
1054 -name
'*.[hcS]' -type f
-print |
sort \
1055 | xargs
$(PERL
) -w scripts
/checkincludes.pl
1058 find
* $(RCS_FIND_IGNORE
) \
1059 -name
'*.[hcS]' -type f
-print |
sort \
1060 | xargs
$(PERL
) -w scripts
/checkversion.pl
1063 $(PERL
) scripts
/reference_discarded.pl
1065 endif #ifeq ($(config-targets),1)
1066 endif #ifeq ($(mixed-targets),1)
1070 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1071 $(PERL
) scripts
/checkstack.pl
$(ARCH
)
1073 # FIXME Should go into a make.lib or something
1074 # ===========================================================================
1076 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1077 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1079 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1080 cmd_rmfiles
= rm -f
$(rm-files
)
1083 a_flags
= -Wp
,-MD
,$(depfile
) $(AFLAGS
) $(AFLAGS_KERNEL
) \
1084 $(NOSTDINC_FLAGS
) $(CPPFLAGS
) \
1085 $(modkern_aflags
) $(EXTRA_AFLAGS
) $(AFLAGS_
$(*F
).o
)
1087 quiet_cmd_as_o_S
= AS
$@
1088 cmd_as_o_S
= $(CC
) $(a_flags
) -c
-o
$@
$<
1090 # read all saved command lines
1092 targets
:= $(wildcard $(sort $(targets
)))
1093 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1095 ifneq ($(cmd_files
),)
1096 $(cmd_files
): ; # Do not try to update included dependency files
1097 include $(cmd_files
)
1100 # execute the command and also postprocess generated .d dependencies
1103 if_changed_dep
= $(if
$(strip $?
$(filter-out FORCE
$(wildcard $^
),$^
)\
1104 $(filter-out $(cmd_
$(1)),$(cmd_
$@
))\
1105 $(filter-out $(cmd_
$@
),$(cmd_
$(1)))),\
1107 $(if
$($(quiet
)cmd_
$(1)),echo
' $(subst ','\'',$($(quiet
)cmd_
$(1)))';) \
1109 scripts/basic/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D
)/.
$(@F
).tmp
; \
1111 mv
-f
$(@D
)/.
$(@F
).tmp
$(@D
)/.
$(@F
).cmd
)
1113 # Usage: $(call if_changed_rule,foo)
1114 # will check if $(cmd_foo) changed, or any of the prequisites changed,
1115 # and if so will execute $(rule_foo)
1117 if_changed_rule
= $(if
$(strip $? \
1118 $(filter-out $(cmd_
$(1)),$(cmd_
$(@F
)))\
1119 $(filter-out $(cmd_
$(@F
)),$(cmd_
$(1)))),\
1122 # If quiet is set, only print short version of command
1124 cmd
= @
$(if
$($(quiet
)cmd_
$(1)),echo
' $($(quiet)cmd_$(1))' &&) $(cmd_
$(1))
1126 # filechk is used to check if the content of a generated file is updated.
1128 # define filechk_sample
1129 # echo $KERNELRELEASE
1131 # version.h : Makefile
1132 # $(call filechk,sample)
1133 # The rule defined shall write to stdout the content of the new file.
1134 # The existing file will be compared with the new one.
1135 # - If no file exist it is created
1136 # - If the content differ the new file is used
1137 # - If they are equal no change, and no timestamp update
1142 mkdir
-p
$(dir $@
); \
1143 $(filechk_
$(1)) < $< > $@.tmp
; \
1144 if
[ -r
$@
] && cmp
-s
$@
$@.tmp
; then \
1152 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
1154 # $(Q)$(MAKE) $(build)=dir
1155 build
:= -f
$(if
$(KBUILD_SRC
),$(srctree
)/)scripts
/Makefile.build obj
1157 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1159 # $(Q)$(MAKE) $(clean)=dir
1160 clean := -f
$(if
$(KBUILD_SRC
),$(srctree
)/)scripts
/Makefile.
clean obj
1162 # $(call descend,<dir>,<target>)
1163 # Recursively call a sub-make in <dir> with target <target>
1164 # Usage is deprecated, because make does not see this as an invocation of make.
1165 descend
=$(Q
)$(MAKE
) -f
$(if
$(KBUILD_SRC
),$(srctree
)/)scripts
/Makefile.build obj
=$(1) $(2)
1167 endif # skip-makefile