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
= $(C
)
52 ifndef KBUILD_CHECKSRC
56 # Use make M=dir to specify directory of external module to build
57 # Old syntax make ... SUBDIRS=$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
$(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 srctree
:= $(if
$(KBUILD_SRC
),$(KBUILD_SRC
),$(CURDIR
))
135 # FIXME - TOPDIR is obsolete, use srctree/objtree
142 export srctree objtree VPATH TOPDIR
145 space
:= $(nullstring
) # end of line
147 # Take the contents of any files called localversion* and the config
148 # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE. Be
149 # careful not to include files twice if building in the source
150 # directory. LOCALVERSION from the command line override all of this
152 ifeq ($(objtree
),$(srctree
))
153 localversion-files
:= $(wildcard $(srctree
)/localversion
*)
155 localversion-files
:= $(wildcard $(objtree
)/localversion
* $(srctree
)/localversion
*)
158 LOCALVERSION
= $(subst $(space
),, \
159 $(shell cat
/dev
/null
$(localversion-files
)) \
160 $(patsubst "%",%,$(CONFIG_LOCALVERSION
)))
162 KERNELRELEASE
=$(VERSION
).
$(PATCHLEVEL
).
$(SUBLEVEL
)$(EXTRAVERSION
)$(LOCALVERSION
)
164 # SUBARCH tells the usermode build what the underlying arch is. That is set
165 # first, and if a usermode build is happening, the "ARCH=um" on the command
166 # line overrides the setting of ARCH below. If a native build is happening,
167 # then ARCH is assigned, getting whatever value it gets normally, and
168 # SUBARCH is subsequently ignored.
170 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/i386
/ -e s
/sun4u
/sparc64
/ \
171 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
172 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ )
174 # Cross compiling and selecting different set of gcc/bin-utils
175 # ---------------------------------------------------------------------------
177 # When performing cross compilation for other architectures ARCH shall be set
178 # to the target architecture. (See arch/* for the possibilities).
179 # ARCH can be set during invocation of make:
181 # Another way is to have ARCH set in the environment.
182 # The default ARCH is the host where make is executed.
184 # CROSS_COMPILE specify the prefix used for all executables used
185 # during compilation. Only gcc and related bin-utils executables
186 # are prefixed with $(CROSS_COMPILE).
187 # CROSS_COMPILE can be set on the command line
188 # make CROSS_COMPILE=ia64-linux-
189 # Alternatively CROSS_COMPILE can be set in the environment.
190 # Default value for CROSS_COMPILE is not to prefix executables
191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
196 # Architecture as present in compile.h
197 UTS_MACHINE
:= $(ARCH
)
199 # SHELL used by kbuild
200 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
201 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
202 else echo sh
; fi
; fi
)
206 HOSTCFLAGS
= -Wall
-Wstrict-prototypes
-O2
-fomit-frame-pointer
209 # Decide whether to build built-in, modular, or both.
210 # Normally, just do built-in.
215 # If we have only "make modules", don't compile built-in objects.
216 # When we're building modules with modversions, we need to consider
217 # the built-in objects during the descend as well, in order to
218 # make sure the checksums are uptodate before we record them.
220 ifeq ($(MAKECMDGOALS
),modules
)
221 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
224 # If we have "make <whatever> modules", compile modules
225 # in addition to whatever we do anyway.
226 # Just "make" or "make all" shall build modules as well
228 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
232 ifeq ($(MAKECMDGOALS
),)
236 export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE
237 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
240 # ---------------------------------------------------------------------------
242 # Normally, we echo the whole command before executing it. By making
243 # that echo $($(quiet)$(cmd)), we now have the possibility to set
244 # $(quiet) to choose other forms of output instead, e.g.
246 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
247 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
249 # If $(quiet) is empty, the whole command will be printed.
250 # If it is set to "quiet_", only the short version will be printed.
251 # If it is set to "silent_", nothing wil be printed at all, since
252 # the variable $(silent_cmd_cc_o_c) doesn't exist.
254 # A simple variant is to prefix commands with $(Q) - that's usefull
255 # for commands that shall be hidden in non-verbose mode.
259 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
260 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
262 ifeq ($(KBUILD_VERBOSE
),1)
270 # If the user is running make -s (silent mode), suppress echoing of
273 ifneq ($(findstring s
,$(MAKEFLAGS
)),)
277 export quiet Q KBUILD_VERBOSE
280 # cc support functions to be used (only) in arch/$(ARCH)/Makefile
281 # See documentation in Documentation/kbuild/makefiles.txt
284 # Usage: cflags-y += $(call gcc-option, -march=winchip-c6, -march=i586)
286 cc-option
= $(shell if
$(CC
) $(CFLAGS
) $(1) -S
-o
/dev
/null
-xc
/dev
/null \
287 > /dev
/null
2>&1; then echo
"$(1)"; else echo
"$(2)"; fi
;)
289 # For backward compatibility
290 check_gcc
= $(warning check_gcc is deprecated
- use cc-option
) \
291 $(call cc-option
, $(1),$(2))
294 # Usage: flag := $(call gcc-option-yn, -march=winchip-c6)
295 cc-option-yn
= $(shell if
$(CC
) $(CFLAGS
) $(1) -S
-o
/dev
/null
-xc
/dev
/null \
296 > /dev
/null
2>&1; then echo
"y"; else echo
"n"; fi
;)
299 # Prefix align with either -falign or -malign
300 cc-option-align
= $(subst -functions
=0,,\
301 $(call cc-option
,-falign-functions
=0,-malign-functions
=0))
304 # Usage gcc-ver := $(call cc-version $(CC))
305 cc-version
= $(shell $(CONFIG_SHELL
) $(srctree
)/scripts
/gcc-version.sh \
306 $(if
$(1), $(1), $(CC
)))
309 # Look for make include files relative to root of kernel src
310 MAKEFLAGS
+= --include-dir
=$(srctree
)
312 # For maximum performance (+ possibly random breakage, uncomment
317 # Make variables (CC, etc...)
319 AS
= $(CROSS_COMPILE
)as
320 LD
= $(CROSS_COMPILE
)ld
321 CC
= $(CROSS_COMPILE
)gcc
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
329 GENKSYMS
= scripts
/genksyms
/genksyms
330 DEPMOD
= /sbin
/depmod
331 KALLSYMS
= scripts
/kallsyms
334 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__
336 CFLAGS_MODULE
= $(MODFLAGS
)
337 AFLAGS_MODULE
= $(MODFLAGS
)
342 NOSTDINC_FLAGS
= -nostdinc
-iwithprefix
include
344 # Use LINUXINCLUDE when you must reference the include/ directory.
345 # Needed to be compatible with the O= option
346 LINUXINCLUDE
:= -Iinclude \
347 $(if
$(KBUILD_SRC
),-Iinclude2
-I
$(srctree
)/include)
349 CPPFLAGS
:= -D__KERNEL__
$(LINUXINCLUDE
)
351 CFLAGS
:= -Wall
-Wstrict-prototypes
-Wno-trigraphs \
352 -fno-strict-aliasing
-fno-common
353 AFLAGS
:= -D__ASSEMBLY__
355 export VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION LOCALVERSION KERNELRELEASE \
356 ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
357 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
358 HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
360 export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
361 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
362 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
364 # When compiling out-of-tree modules, put MODVERDIR in the module
365 # tree rather than in the kernel tree. The kernel tree might
367 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
369 # The temporary file to save gcc -MD generated dependencies must not
372 depfile
= $(subst $(comma
),_
,$(@D
)/.
$(@F
).d
)
374 # Files to ignore in find ... statements
376 RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o
-name CVS
-o
-name .
pc \
) -prune
-o
377 RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn
--exclude CVS
--exclude .
pc
379 # ===========================================================================
380 # Rules shared between *config targets and build targets
382 # Basic helpers built in scripts/
383 .PHONY
: scripts_basic
385 $(Q
)$(MAKE
) $(build
)=scripts
/basic
387 .PHONY
: outputmakefile
388 # outputmakefile generate a Makefile to be placed in output directory, if
389 # using a seperate output directory. This allows convinient use
390 # of make in output directory
392 $(Q
)if
/usr
/bin
/env
test ! $(srctree
) -ef
$(objtree
); then \
393 $(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
394 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
) \
395 > $(objtree
)/Makefile
; \
396 echo
' GEN $(objtree)/Makefile'; \
399 # To make sure we do not include .config for any of the *config targets
400 # catch them early, and hand them over to scripts/kconfig/Makefile
401 # It is allowed to specify more targets when calling make, including
402 # mixing *config targets and build targets.
403 # For example 'make oldconfig all'.
404 # Detect when mixed targets is specified, and make a second invocation
405 # of make so .config is not included in this case either (for *config).
407 no-dot-config-targets
:= clean mrproper
distclean \
408 cscope TAGS
tags help
%docs
check%
414 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
415 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
420 ifeq ($(KBUILD_EXTMOD
),)
421 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
423 ifneq ($(filter-out config
%config
,$(MAKECMDGOALS
)),)
429 ifeq ($(mixed-targets
),1)
430 # ===========================================================================
431 # We're called with mixed targets (*config and build targets).
432 # Handle them one by one.
435 $(Q
)$(MAKE
) -C
$(srctree
) KBUILD_SRC
= $@
438 ifeq ($(config-targets
),1)
439 # ===========================================================================
440 # *config targets only - make sure prerequisites are updated, and descend
441 # in scripts/kconfig to make the *config target
443 config
: scripts_basic outputmakefile FORCE
444 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
445 %config
: scripts_basic outputmakefile FORCE
446 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
449 # ===========================================================================
450 # Build targets only - this includes vmlinux, arch specific targets, clean
451 # targets and others. In general all targets except *config targets.
453 ifeq ($(KBUILD_EXTMOD
),)
454 # Additional helpers built in scripts/
455 # Carefully list dependencies so we do not try to build scripts twice
458 scripts
: scripts_basic
include/config
/MARKER
459 $(Q
)$(MAKE
) $(build
)=$(@
)
461 scripts_basic
: include/linux
/autoconf.h
463 # Objects we will link into vmlinux / subdirs we need to visit
465 drivers-y
:= drivers
/ sound
/
469 endif # KBUILD_EXTMOD
471 ifeq ($(dot-config
),1)
472 # In this section, we need .config
474 # Read in dependencies to all Kconfig* files, make sure to run
475 # oldconfig if changes are detected.
480 # If .config needs to be updated, it will be done via the dependency
481 # that autoconf has on .config.
482 # To avoid any implicit rule to kick in, define an empty command
485 # If .config is newer than include/linux/autoconf.h, someone tinkered
486 # with it and forgot to run make oldconfig
487 include/linux
/autoconf.h
: .config
488 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
490 # Dummy target needed, because used as prerequisite
491 include/linux
/autoconf.h
: ;
494 # The all: target is the default when no target is given on the
496 # This allow a user to issue only 'make' to build a kernel including modules
497 # Defaults vmlinux but it is usually overriden in the arch makefile
500 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
506 #Add align options if CONFIG_CC_* is not equal to 0
507 add-align
= $(if
$(filter-out 0,$($(1))),$(cc-option-align
)$(2)=$($(1)))
508 CFLAGS
+= $(call add-align
,CONFIG_CC_ALIGN_FUNCTIONS
,-functions
)
509 CFLAGS
+= $(call add-align
,CONFIG_CC_ALIGN_LABELS
,-labels
)
510 CFLAGS
+= $(call add-align
,CONFIG_CC_ALIGN_LOOPS
,-loops
)
511 CFLAGS
+= $(call add-align
,CONFIG_CC_ALIGN_JUMPS
,-jumps
)
513 ifdef CONFIG_FRAME_POINTER
514 CFLAGS
+= -fno-omit-frame-pointer
516 CFLAGS
+= -fomit-frame-pointer
519 ifdef CONFIG_DEBUG_INFO
523 # warn about C99 declaration after statement
524 CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
526 include $(srctree
)/arch
/$(ARCH
)/Makefile
528 # Default kernel image to build when no specific target is given.
529 # KBUILD_IMAGE may be overruled on the commandline or
530 # set in the environment
531 # Also any assingments in arch/$(ARCH)/Makefiel take precedence over
533 export KBUILD_IMAGE ?
= vmlinux
536 # INSTALL_PATH specifies where to place the updated kernel and system map
537 # images. Uncomment if you want to place them anywhere other than root.
540 #export INSTALL_PATH=/boot
543 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
544 # relocations required by build roots. This is not defined in the
545 # makefile but the arguement can be passed to make if needed.
548 MODLIB
:= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
552 ifeq ($(KBUILD_EXTMOD
),)
553 core-y
+= kernel
/ mm
/ fs
/ ipc
/ security
/ crypto
/
555 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
556 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
557 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
)))
559 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
561 $(core-n
) $(core-
) $(drivers-n
) $(drivers-
) \
562 $(net-n
) $(net-
) $(libs-n
) $(libs-
))))
564 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
565 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
566 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
567 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
568 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
569 libs-y2
:= $(patsubst %/, %/built-in.o
, $(libs-y
))
570 libs-y
:= $(libs-y1
) $(libs-y2
)
573 # ---------------------------------------------------------------------------
574 # vmlinux is build from the objects selected by $(vmlinux-init) and
575 # $(vmlinux-main). Most are built-in.o files from top-level directories
576 # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
577 # Ordering when linking is important, and $(vmlinux-init) must be first.
582 # +-< $(vmlinux-init)
583 # | +--< init/version.o + more
585 # +--< $(vmlinux-main)
586 # | +--< driver/built-in.o mm/built-in.o + more
588 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
590 # vmlinux version (uname -v) cannot be updated during normal
591 # descending-into-subdirs phase since we do not yet know if we need to
593 # Therefore this step is delayed until just before final link of vmlinux -
594 # except in the kallsyms case where it is done just before adding the
595 # symbols to the kernel.
597 # System.map is generated to document addresses of all kernel symbols
599 vmlinux-init
:= $(head-y
) $(init-y
)
600 vmlinux-main
:= $(core-y
) $(libs-y
) $(drivers-y
) $(net-y
)
601 vmlinux-all
:= $(vmlinux-init
) $(vmlinux-main
)
602 vmlinux-lds
:= arch
/$(ARCH
)/kernel
/vmlinux.lds
604 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
605 # May be overridden by arch/$(ARCH)/Makefile
606 quiet_cmd_vmlinux__ ?
= LD
$@
607 cmd_vmlinux__ ?
= $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) -o
$@ \
608 -T
$(vmlinux-lds
) $(vmlinux-init
) \
609 --start-group
$(vmlinux-main
) --end-group \
610 $(filter-out $(vmlinux-lds
) $(vmlinux-init
) $(vmlinux-main
) FORCE
,$^
)
612 # Generate new vmlinux version
613 quiet_cmd_vmlinux_version
= GEN .version
614 cmd_vmlinux_version
= set
-e
; \
615 .
$(srctree
)/scripts
/mkversion
> .tmp_version
; \
616 mv
-f .tmp_version .version
; \
617 $(MAKE
) $(build
)=init
619 # Generate System.map
620 quiet_cmd_sysmap
= SYSMAP
621 cmd_sysmap
= $(CONFIG_SHELL
) $(srctree
)/scripts
/mksysmap
624 # If CONFIG_KALLSYMS is set .version is already updated
625 # Generate System.map and verify that the content is consistent
627 define rule_vmlinux__
628 $(if
$(CONFIG_KALLSYMS
),,+$(call cmd
,vmlinux_version
))
630 $(call cmd
,vmlinux__
)
631 $(Q
)echo
'cmd_$@ := $(cmd_vmlinux__)' > $(@D
)/.
$(@F
).cmd
633 $(Q
)$(if
$($(quiet
)cmd_sysmap
), \
634 echo
' $($(quiet)cmd_sysmap) System.map' &&) \
635 $(cmd_sysmap
) $@ System.map
; \
636 if
[ $$?
-ne
0 ]; then \
644 ifdef CONFIG_KALLSYMS
645 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
646 # It's a three stage process:
647 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
649 # Running kallsyms on that gives us .tmp_kallsyms1.o with
650 # the right size - vmlinux version (uname -v) is updated during this step
651 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
652 # but due to the added section, some addresses have shifted.
653 # From here, we generate a correct .tmp_kallsyms2.o
654 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
655 # o Verify that the System.map from vmlinux matches the map from
656 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
657 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
658 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
659 # temporary bypass to allow the kernel to be built while the
660 # maintainers work out what went wrong with kallsyms.
662 ifdef CONFIG_KALLSYMS_EXTRA_PASS
668 kallsyms.o
:= .tmp_kallsyms
$(last_kallsyms
).o
670 define verify_kallsyms
671 $(Q
)$(if
$($(quiet
)cmd_sysmap
), \
672 echo
' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
673 $(cmd_sysmap
) .tmp_vmlinux
$(last_kallsyms
) .tmp_System.map
674 $(Q
)cmp
-s System.map .tmp_System.map || \
675 (echo Inconsistent kallsyms data
; \
676 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS
; \
677 rm .tmp_kallsyms
* ; /bin
/false
)
680 # Update vmlinux version before link
681 # Use + in front of this rule to silent warning about make -j1
682 cmd_ksym_ld
= $(cmd_vmlinux__
)
684 +$(call cmd
,vmlinux_version
)
685 $(call cmd
,vmlinux__
)
686 $(Q
)echo
'cmd_$@ := $(cmd_vmlinux__)' > $(@D
)/.
$(@F
).cmd
689 # Generate .S file with all kernel symbols
690 quiet_cmd_kallsyms
= KSYM
$@
691 cmd_kallsyms
= $(NM
) -n
$< |
$(KALLSYMS
) \
692 $(if
$(CONFIG_KALLSYMS_ALL
),--all-symbols
) > $@
694 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o
: %.o
: %.S scripts FORCE
695 $(call if_changed_dep
,as_o_S
)
697 .tmp_kallsyms
%.S
: .tmp_vmlinux
% $(KALLSYMS
)
700 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
701 .tmp_vmlinux1
: $(vmlinux-lds
) $(vmlinux-all
) FORCE
702 $(call if_changed_rule
,ksym_ld
)
704 .tmp_vmlinux2
: $(vmlinux-lds
) $(vmlinux-all
) .tmp_kallsyms1.o FORCE
705 $(call if_changed
,vmlinux__
)
707 .tmp_vmlinux3
: $(vmlinux-lds
) $(vmlinux-all
) .tmp_kallsyms2.o FORCE
708 $(call if_changed
,vmlinux__
)
710 # Needs to visit scripts/ before $(KALLSYMS) can be used.
711 $(KALLSYMS
): scripts
;
713 endif # ifdef CONFIG_KALLSYMS
715 # vmlinux image - including updated kernel symbols
716 vmlinux
: $(vmlinux-lds
) $(vmlinux-init
) $(vmlinux-main
) $(kallsyms.o
) FORCE
717 $(call if_changed_rule
,vmlinux__
)
719 # The actual objects are generated when descending,
720 # make sure no implicit rule kicks in
721 $(sort $(vmlinux-init
) $(vmlinux-main
)) $(vmlinux-lds
): $(vmlinux-dirs
) ;
723 # Handle descending into subdirectories listed in $(vmlinux-dirs)
724 # Preset locale variables to speed up the build process. Limit locale
725 # tweaks to this spot to avoid wrong language settings when running
726 # make menuconfig etc.
727 # Error messages still appears in the original language
729 .PHONY
: $(vmlinux-dirs
)
730 $(vmlinux-dirs
): prepare-all scripts
731 $(Q
)$(MAKE
) $(build
)=$@
733 # Things we need to do before we recursively start building the kernel
734 # or the modules are listed in "prepare-all".
735 # A multi level approach is used. prepare1 is updated first, then prepare0.
736 # prepare-all is the collection point for the prepare targets.
738 .PHONY
: prepare-all prepare prepare0 prepare1 prepare2
740 # prepare2 is used to check if we are building in a separate output directory,
742 # 1) Check that make has not been executed in the kernel src $(srctree)
743 # 2) Create the include2 directory, used for the second asm symlink
746 ifneq ($(KBUILD_SRC
),)
747 @echo
' Using $(srctree) as source for kernel'
748 $(Q
)if
[ -h
$(srctree
)/include/asm
-o
-f
$(srctree
)/.config
]; then \
749 echo
" $(srctree) is not clean, please run 'make mrproper'";\
750 echo
" in the '$(srctree)' directory.";\
753 $(Q
)if
[ ! -d include2
]; then mkdir
-p include2
; fi
;
754 $(Q
)ln
-fsn
$(srctree
)/include/asm-
$(ARCH
) include2
/asm
757 # prepare1 creates a makefile if using a separate output directory
758 prepare1
: prepare2 outputmakefile
760 prepare0
: prepare1
include/linux
/version.h
include/asm
include/config
/MARKER
761 ifneq ($(KBUILD_MODULES
),)
762 $(Q
)rm -rf
$(MODVERDIR
)
763 $(Q
)mkdir
-p
$(MODVERDIR
)
766 # All the preparing..
767 prepare-all
: prepare0 prepare
769 # Leave this as default for preprocessing vmlinux.lds.S, which is now
770 # done in arch/$(ARCH)/kernel/Makefile
772 export CPPFLAGS_vmlinux.lds
+= -P
-C
-U
$(ARCH
)
775 # ---------------------------------------------------------------------------
777 %.s
: %.c scripts FORCE
778 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
779 %.i
: %.c scripts FORCE
780 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
781 %.o
: %.c scripts FORCE
782 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
783 %/: scripts prepare FORCE
784 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) $(build
)=$(@D
)
785 %.lst
: %.c scripts FORCE
786 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
787 %.s
: %.S scripts FORCE
788 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
789 %.o
: %.S scripts FORCE
790 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
792 # FIXME: The asm symlink changes when $(ARCH) changes. That's
793 # hard to detect, but I suppose "make mrproper" is a good idea
794 # before switching between archs anyway.
797 @echo
' SYMLINK $@ -> include/asm-$(ARCH)'
798 $(Q
)if
[ ! -d
include ]; then mkdir
-p
include; fi
;
799 @ln
-fsn asm-
$(ARCH
) $@
801 # Split autoconf.h into include/linux/config/*
803 include/config
/MARKER
: include/linux
/autoconf.h
804 @echo
' SPLIT include/linux/autoconf.h -> include/config/*'
805 @scripts
/basic
/split-include
include/linux
/autoconf.h
include/config
808 # Generate some files
809 # ---------------------------------------------------------------------------
811 # KERNELRELEASE can change from a few different places, meaning version.h
812 # needs to be updated, so this check is forced on all builds
816 define filechk_version.h
817 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
818 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
821 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
822 echo \
#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
823 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
827 include/linux
/version.h
: $(srctree
)/Makefile FORCE
828 $(call filechk
,version.h
)
830 # ---------------------------------------------------------------------------
834 @echo
'*** Warning: make $@ is unnecessary now.'
836 # ---------------------------------------------------------------------------
841 # By default, build modules as well
848 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
)
849 @echo
' Building modules, stage 2.';
850 $(Q
)$(MAKE
) -rR
-f
$(srctree
)/scripts
/Makefile.modpost
853 # Target to prepare building external modules
854 .PHONY
: modules_prepare
855 modules_prepare
: prepare-all scripts
857 # Target to install modules
858 .PHONY
: modules_install
859 modules_install
: _modinst_ _modinst_post
863 @if
[ -z
"`$(DEPMOD) -V | grep module-init-tools`" ]; then \
864 echo
"Warning: you may need to install module-init-tools"; \
865 echo
"See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
868 @
rm -rf
$(MODLIB
)/kernel
869 @
rm -f
$(MODLIB
)/source
870 @mkdir
-p
$(MODLIB
)/kernel
871 @ln
-s
$(srctree
) $(MODLIB
)/source
872 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
873 rm -f
$(MODLIB
)/build
; \
874 ln
-s
$(objtree
) $(MODLIB
)/build
; \
876 $(Q
)$(MAKE
) -rR
-f
$(srctree
)/scripts
/Makefile.modinst
878 # If System.map exists, run depmod. This deliberately does not have a
879 # dependency on System.map since that would run the dependency tree on
880 # vmlinux. This depmod is only for convenience to give the initial
881 # boot a modules.dep even before / is mounted read-write. However the
882 # boot script depmod is the master version.
883 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
886 depmod_opts
:= -b
$(INSTALL_MOD_PATH
) -r
888 .PHONY
: _modinst_post
889 _modinst_post
: _modinst_
890 if
[ -r System.map
]; then
$(DEPMOD
) -ae
-F System.map
$(depmod_opts
) $(KERNELRELEASE
); fi
892 else # CONFIG_MODULES
894 # Modules not configured
895 # ---------------------------------------------------------------------------
897 modules modules_install
: FORCE
899 @echo
"The present kernel configuration has modules disabled."
900 @echo
"Type 'make config' and enable loadable module support."
901 @echo
"Then build a kernel with module support enabled."
905 endif # CONFIG_MODULES
907 # Generate asm-offsets.h
908 # ---------------------------------------------------------------------------
910 define filechk_gen-asm-offsets
912 echo
"#ifndef __ASM_OFFSETS_H__"; \
913 echo
"#define __ASM_OFFSETS_H__"; \
915 echo
" * DO NOT MODIFY."; \
917 echo
" * This file was generated by arch/$(ARCH)/Makefile"; \
921 sed
-ne
"/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
928 # Cleaning is done on three levels.
929 # make clean Delete most generated files
930 # Leave enough to build external modules
931 # make mrproper Delete the current configuration, and all generated files
932 # make distclean Remove editor backup files, patch leftover files and the like
934 # Directories & files removed with 'make clean'
935 CLEAN_DIRS
+= $(MODVERDIR
)
936 CLEAN_FILES
+= vmlinux System.map \
937 .tmp_kallsyms
* .tmp_version .tmp_vmlinux
* .tmp_System.map
939 # Directories & files removed with 'make mrproper'
940 MRPROPER_DIRS
+= include/config include2
941 MRPROPER_FILES
+= .config .config.old
include/asm .version \
942 include/linux
/autoconf.h
include/linux
/version.h \
943 Module.symvers
tags TAGS cscope
*
945 # clean - Delete most, but leave enough to build external modules
947 clean: rm-dirs
:= $(CLEAN_DIRS
)
948 clean: rm-files
:= $(CLEAN_FILES
)
949 clean-dirs
:= $(addprefix _clean_
,$(vmlinux-alldirs
))
951 .PHONY
: $(clean-dirs
) clean archclean
953 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
955 clean: archclean
$(clean-dirs
)
958 @find .
$(RCS_FIND_IGNORE
) \
959 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
960 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
) \
961 -type f
-print | xargs
rm -f
963 # mrproper - Delete all generated files, including .config
965 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
966 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
967 mrproper-dirs
:= $(addprefix _mrproper_
,Documentation
/DocBook scripts
)
969 .PHONY
: $(mrproper-dirs
) mrproper archmrproper
971 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
973 mrproper
: clean archmrproper
$(mrproper-dirs
)
982 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
983 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
984 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'.*.orig' \
985 -o
-name
'.*.rej' -o
-size
0 \
986 -o
-name
'*%' -o
-name
'.*.cmd' -o
-name
'core' \
) \
987 -type f
-print | xargs
rm -f
990 # Packaging of the kernel to various formats
991 # ---------------------------------------------------------------------------
992 # rpm target kept for backward compatibility
993 package-dir
:= $(srctree
)/scripts
/package
998 $(Q
)$(MAKE
) -f
$(package-dir
)/Makefile
$@
1000 $(Q
)$(MAKE
) -f
$(package-dir
)/Makefile
$@
1003 # Brief documentation of the typical targets used
1004 # ---------------------------------------------------------------------------
1006 boards
:= $(wildcard $(srctree
)/arch
/$(ARCH
)/configs
/*_defconfig
)
1007 boards
:= $(notdir $(boards
))
1010 @echo
'Cleaning targets:'
1011 @echo
' clean - remove most generated files but keep the config'
1012 @echo
' mrproper - remove all generated files + config + various backup files'
1014 @echo
'Configuration targets:'
1015 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1017 @echo
'Other generic targets:'
1018 @echo
' all - Build all targets marked with [*]'
1019 @echo
'* vmlinux - Build the bare kernel'
1020 @echo
'* modules - Build all modules'
1021 @echo
' modules_install - Install all modules'
1022 @echo
' dir/ - Build all files in dir and below'
1023 @echo
' dir/file.[ois] - Build specified target only'
1024 @echo
' rpm - Build a kernel as an RPM package'
1025 @echo
' tags/TAGS - Generate tags file for editors'
1026 @echo
' cscope - Generate cscope index'
1028 @echo
'Static analysers'
1029 @echo
' buildcheck - List dangling references to vmlinux discarded sections'
1030 @echo
' and init sections from non-init sections'
1031 @echo
' checkstack - Generate a list of stack hogs'
1032 @echo
' namespacecheck - Name space analysis on compiled kernel'
1034 @echo
'Kernel packaging:'
1035 @
$(MAKE
) -f
$(package-dir
)/Makefile help
1037 @echo
'Documentation targets:'
1038 @
$(MAKE
) -f
$(srctree
)/Documentation
/DocBook
/Makefile dochelp
1040 @echo
'Architecture specific targets ($(ARCH)):'
1041 @
$(if
$(archhelp
),$(archhelp
),\
1042 echo
' No architecture specific help defined for $(ARCH)')
1045 $(foreach b
, $(boards
), \
1046 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1049 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1050 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1051 @echo
' make C=1 [targets] Check all c source with $$CHECK (sparse)'
1052 @echo
' make C=2 [targets] Force check of all c source with $$CHECK (sparse)'
1054 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1055 @echo
'For further info see the ./README file'
1058 # Documentation targets
1059 # ---------------------------------------------------------------------------
1060 %docs
: scripts_basic FORCE
1061 $(Q
)$(MAKE
) $(build
)=Documentation
/DocBook
$@
1063 else # KBUILD_EXTMOD
1066 # External module support.
1067 # When building external modules the kernel used as basis is considered
1068 # read-only, and no consistency checks are made and the make
1069 # system is not used on the basis kernel. If updates are required
1070 # in the basis kernel ordinary make commands (without M=...) must
1073 # The following are the only valid targets when building external
1075 # make M=dir clean Delete all automatically generated files
1076 # make M=dir modules Make all modules in specified dir
1077 # make M=dir Same as 'make M=dir modules'
1078 # make M=dir modules_install
1079 # Install the modules build in the module directory
1080 # Assumes install directory is already created
1082 # We are always building modules
1086 $(Q
)mkdir
-p
$(MODVERDIR
)
1088 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1089 .PHONY
: $(module-dirs
) modules
1090 $(module-dirs
): crmodverdir
1091 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1093 modules
: $(module-dirs
)
1094 @echo
' Building modules, stage 2.';
1095 $(Q
)$(MAKE
) -rR
-f
$(srctree
)/scripts
/Makefile.modpost
1097 .PHONY
: modules_install
1099 $(Q
)$(MAKE
) -rR
-f
$(srctree
)/scripts
/Makefile.modinst
1101 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1103 .PHONY
: $(clean-dirs
) clean
1105 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1107 clean: rm-dirs
:= $(MODVERDIR
)
1108 clean: $(clean-dirs
)
1110 @find
$(KBUILD_EXTMOD
) $(RCS_FIND_IGNORE
) \
1111 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1112 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
) \
1113 -type f
-print | xargs
rm -f
1116 @echo
' Building external modules.'
1117 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1119 @echo
' modules - default target, build the module(s)'
1120 @echo
' modules_install - install the module'
1121 @echo
' clean - remove generated files in module directory only'
1123 endif # KBUILD_EXTMOD
1125 # Generate tags for editors
1126 # ---------------------------------------------------------------------------
1129 ( find
$(srctree
) $(RCS_FIND_IGNORE
) \
1130 \
( -name
include -o
-name arch \
) -prune
-o \
1131 -name
'*.[chS]' -print; \
1132 find
$(srctree
)/arch
/$(ARCH
) $(RCS_FIND_IGNORE
) \
1133 -name
'*.[chS]' -print; \
1134 find
$(srctree
)/security
/selinux
/include $(RCS_FIND_IGNORE
) \
1135 -name
'*.[chS]' -print; \
1136 find
$(srctree
)/include $(RCS_FIND_IGNORE
) \
1137 \
( -name config
-o
-name
'asm-*' \
) -prune \
1138 -o
-name
'*.[chS]' -print; \
1139 find
$(srctree
)/include/asm-
$(ARCH
) $(RCS_FIND_IGNORE
) \
1140 -name
'*.[chS]' -print; \
1141 find
$(srctree
)/include/asm-generic
$(RCS_FIND_IGNORE
) \
1142 -name
'*.[chS]' -print )
1145 quiet_cmd_cscope-file
= FILELST cscope.files
1146 cmd_cscope-file
= $(all-sources
) > cscope.files
1148 quiet_cmd_cscope
= MAKE cscope.out
1149 cmd_cscope
= cscope
-k
-b
-q
1152 $(call cmd
,cscope-file
)
1155 quiet_cmd_TAGS
= MAKE
$@
1156 cmd_TAGS
= $(all-sources
) | etags
-
1158 # Exuberant ctags works better with -I
1160 quiet_cmd_tags
= MAKE
$@
1163 CTAGSF
=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_NOVERS"`; \
1164 $(all-sources
) | xargs ctags
$$CTAGSF -a
1174 # Scripts to check various things for consistency
1175 # ---------------------------------------------------------------------------
1178 find
* $(RCS_FIND_IGNORE
) \
1179 -name
'*.[hcS]' -type f
-print |
sort \
1180 | xargs
$(PERL
) -w scripts
/checkconfig.pl
1183 find
* $(RCS_FIND_IGNORE
) \
1184 -name
'*.[hcS]' -type f
-print |
sort \
1185 | xargs
$(PERL
) -w scripts
/checkincludes.pl
1188 find
* $(RCS_FIND_IGNORE
) \
1189 -name
'*.[hcS]' -type f
-print |
sort \
1190 | xargs
$(PERL
) -w scripts
/checkversion.pl
1193 $(PERL
) $(srctree
)/scripts
/reference_discarded.pl
1194 $(PERL
) $(srctree
)/scripts
/reference_init.pl
1197 $(PERL
) $(srctree
)/scripts
/namespace.pl
1199 endif #ifeq ($(config-targets),1)
1200 endif #ifeq ($(mixed-targets),1)
1204 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1205 $(PERL
) $(src
)/scripts
/checkstack.pl
$(ARCH
)
1207 # FIXME Should go into a make.lib or something
1208 # ===========================================================================
1210 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1211 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1213 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1214 cmd_rmfiles
= rm -f
$(rm-files
)
1217 a_flags
= -Wp
,-MD
,$(depfile
) $(AFLAGS
) $(AFLAGS_KERNEL
) \
1218 $(NOSTDINC_FLAGS
) $(CPPFLAGS
) \
1219 $(modkern_aflags
) $(EXTRA_AFLAGS
) $(AFLAGS_
$(*F
).o
)
1221 quiet_cmd_as_o_S
= AS
$@
1222 cmd_as_o_S
= $(CC
) $(a_flags
) -c
-o
$@
$<
1224 # read all saved command lines
1226 targets
:= $(wildcard $(sort $(targets
)))
1227 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1229 ifneq ($(cmd_files
),)
1230 $(cmd_files
): ; # Do not try to update included dependency files
1231 include $(cmd_files
)
1234 # Execute command and generate cmd file
1235 if_changed
= $(if
$(strip $? \
1236 $(filter-out $(cmd_
$(1)),$(cmd_
$@
))\
1237 $(filter-out $(cmd_
$@
),$(cmd_
$(1)))),\
1239 $(if
$($(quiet
)cmd_
$(1)),echo
' $(subst ','\'',$($(quiet
)cmd_
$(1)))';) \
1241 echo 'cmd_
$@
:= $(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D
)/.
$(@F
).cmd
)
1244 # execute the command and also postprocess generated .d dependencies
1246 if_changed_dep
= $(if
$(strip $?
$(filter-out FORCE
$(wildcard $^
),$^
)\
1247 $(filter-out $(cmd_
$(1)),$(cmd_
$@
))\
1248 $(filter-out $(cmd_
$@
),$(cmd_
$(1)))),\
1250 $(if
$($(quiet
)cmd_
$(1)),echo
' $(subst ','\'',$($(quiet
)cmd_
$(1)))';) \
1252 scripts/basic/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D
)/.
$(@F
).tmp
; \
1254 mv
-f
$(@D
)/.
$(@F
).tmp
$(@D
)/.
$(@F
).cmd
)
1256 # Usage: $(call if_changed_rule,foo)
1257 # will check if $(cmd_foo) changed, or any of the prequisites changed,
1258 # and if so will execute $(rule_foo)
1260 if_changed_rule
= $(if
$(strip $? \
1261 $(filter-out $(cmd_
$(1)),$(cmd_
$(@F
)))\
1262 $(filter-out $(cmd_
$(@F
)),$(cmd_
$(1)))),\
1265 # If quiet is set, only print short version of command
1267 cmd
= @
$(if
$($(quiet
)cmd_
$(1)),echo
' $($(quiet)cmd_$(1))' &&) $(cmd_
$(1))
1269 # filechk is used to check if the content of a generated file is updated.
1271 # define filechk_sample
1272 # echo $KERNELRELEASE
1274 # version.h : Makefile
1275 # $(call filechk,sample)
1276 # The rule defined shall write to stdout the content of the new file.
1277 # The existing file will be compared with the new one.
1278 # - If no file exist it is created
1279 # - If the content differ the new file is used
1280 # - If they are equal no change, and no timestamp update
1285 mkdir
-p
$(dir $@
); \
1286 $(filechk_
$(1)) < $< > $@.tmp
; \
1287 if
[ -r
$@
] && cmp
-s
$@
$@.tmp
; then \
1295 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
1297 # $(Q)$(MAKE) $(build)=dir
1298 build
:= -f
$(if
$(KBUILD_SRC
),$(srctree
)/)scripts
/Makefile.build obj
1300 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1302 # $(Q)$(MAKE) $(clean)=dir
1303 clean := -f
$(if
$(KBUILD_SRC
),$(srctree
)/)scripts
/Makefile.
clean obj
1305 # $(call descend,<dir>,<target>)
1306 # Recursively call a sub-make in <dir> with target <target>
1307 # Usage is deprecated, because make does not see this as an invocation of make.
1308 descend
=$(Q
)$(MAKE
) -f
$(if
$(KBUILD_SRC
),$(srctree
)/)scripts
/Makefile.build obj
=$(1) $(2)
1310 endif # skip-makefile