8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
14 # o use make's built-in rules and variables
15 # (this increases performance and avoids hard-to-debug behaviour);
16 # o print "Entering directory ...";
17 MAKEFLAGS
+= -rR
--no-print-directory
19 # We are using a recursive build, so we need to do a little thinking
20 # to get the ordering right.
22 # Most importantly: sub-Makefiles should only ever modify files in
23 # their own directory. If in some directory we have a dependency on
24 # a file in another dir (which doesn't happen often, but it's often
25 # unavoidable when linking the built-in.o targets which finally
26 # turn into vmlinux), we will call a sub make in that other dir, and
27 # after that we are sure that everything which is in that other dir
30 # The only cases where we need to modify files which have global
31 # effects are thus separated out and done before the recursive
32 # descending is started. They are now explicitly listed as the
35 # To put more focus on warnings, be less verbose as default
36 # Use 'make V=1' to see the full commands
39 ifeq ("$(origin V)", "command line")
47 # Call a source code checker (by default, "sparse") as part of the
50 # Use 'make C=1' to enable checking of only re-compiled files.
51 # Use 'make C=2' to enable checking of *all* source files, regardless
52 # of whether they are re-compiled or not.
54 # See the file "Documentation/sparse.txt" for more details, including
55 # where to get the "sparse" utility.
58 ifeq ("$(origin C)", "command line")
59 KBUILD_CHECKSRC
= $(C
)
62 ifndef KBUILD_CHECKSRC
66 # Use make M=dir to specify directory of external module to build
67 # Old syntax make ... SUBDIRS=$PWD is still supported
68 # Setting the environment variable KBUILD_EXTMOD take precedence
70 KBUILD_EXTMOD ?
= $(SUBDIRS
)
73 ifeq ("$(origin M)", "command line")
79 # kbuild supports saving output files in a separate directory.
80 # To locate output files in a separate directory two syntaxes are supported.
81 # In both cases the working directory must be the root of the kernel src.
83 # Use "make O=dir/to/store/output/files/"
85 # 2) Set KBUILD_OUTPUT
86 # Set the environment variable KBUILD_OUTPUT to point to the directory
87 # where the output files shall be placed.
88 # export KBUILD_OUTPUT=dir/to/store/output/files/
91 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
95 # KBUILD_SRC is set on invocation of make in OBJ directory
96 # KBUILD_SRC is not intended to be used by the regular user (for now)
99 # OK, Make called in directory where kernel src resides
100 # Do we want to locate output files in a separate directory?
102 ifeq ("$(origin O)", "command line")
103 KBUILD_OUTPUT
:= $(O
)
107 # That's our default target when none is given on the command line
111 # Cancel implicit rules on top Makefile
112 $(CURDIR
)/Makefile Makefile
: ;
114 ifneq ($(KBUILD_OUTPUT
),)
115 # Invoke a second make in the output directory, passing relevant variables
116 # check that the output directory actually exists
117 saved-output
:= $(KBUILD_OUTPUT
)
118 KBUILD_OUTPUT
:= $(shell cd
$(KBUILD_OUTPUT
) && /bin
/pwd
)
119 $(if
$(KBUILD_OUTPUT
),, \
120 $(error output directory
"$(saved-output)" does not exist
))
122 PHONY
+= $(MAKECMDGOALS
) sub-make
124 $(filter-out _all sub-make
$(CURDIR
)/Makefile
, $(MAKECMDGOALS
)) _all
: sub-make
128 $(if
$(KBUILD_VERBOSE
:1=),@
)$(MAKE
) -C
$(KBUILD_OUTPUT
) \
129 KBUILD_SRC
=$(CURDIR
) \
130 KBUILD_EXTMOD
="$(KBUILD_EXTMOD)" -f
$(CURDIR
)/Makefile \
131 $(filter-out _all sub-make
,$(MAKECMDGOALS
))
133 # Leave processing to above invocation of make
135 endif # ifneq ($(KBUILD_OUTPUT),)
136 endif # ifeq ($(KBUILD_SRC),)
138 # We process the rest of the Makefile if this is the final invocation of make
139 ifeq ($(skip-makefile
),)
141 # If building an external module we do not care about the all: rule
142 # but instead _all depend on modules
144 ifeq ($(KBUILD_EXTMOD
),)
150 srctree
:= $(if
$(KBUILD_SRC
),$(KBUILD_SRC
),$(CURDIR
))
152 # FIXME - TOPDIR is obsolete, use srctree/objtree
157 VPATH
:= $(srctree
)$(if
$(KBUILD_EXTMOD
),:$(KBUILD_EXTMOD
))
159 export srctree objtree VPATH TOPDIR
162 # SUBARCH tells the usermode build what the underlying arch is. That is set
163 # first, and if a usermode build is happening, the "ARCH=um" on the command
164 # line overrides the setting of ARCH below. If a native build is happening,
165 # then ARCH is assigned, getting whatever value it gets normally, and
166 # SUBARCH is subsequently ignored.
168 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/i386
/ -e s
/sun4u
/sparc64
/ \
169 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
170 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ \
171 -e s
/ppc.
*/powerpc
/ -e s
/mips.
*/mips
/ \
174 # Cross compiling and selecting different set of gcc/bin-utils
175 # ---------------------------------------------------------------------------
177 # When performing cross compilation for other architectures ARCH shall be set
178 # to the target architecture. (See arch/* for the possibilities).
179 # ARCH can be set during invocation of make:
181 # Another way is to have ARCH set in the environment.
182 # The default ARCH is the host where make is executed.
184 # CROSS_COMPILE specify the prefix used for all executables used
185 # during compilation. Only gcc and related bin-utils executables
186 # are prefixed with $(CROSS_COMPILE).
187 # CROSS_COMPILE can be set on the command line
188 # make CROSS_COMPILE=ia64-linux-
189 # Alternatively CROSS_COMPILE can be set in the environment.
190 # Default value for CROSS_COMPILE is not to prefix executables
191 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
192 export KBUILD_BUILDHOST
:= $(SUBARCH
)
196 # Architecture as present in compile.h
197 UTS_MACHINE
:= $(ARCH
)
200 # Additional ARCH settings for x86
204 ifeq ($(ARCH
),x86_64
)
208 KCONFIG_CONFIG ?
= .config
210 # SHELL used by kbuild
211 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
212 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
213 else echo sh
; fi
; fi
)
217 HOSTCFLAGS
= -Wall
-Wstrict-prototypes
-O2
-fomit-frame-pointer
220 # Decide whether to build built-in, modular, or both.
221 # Normally, just do built-in.
226 # If we have only "make modules", don't compile built-in objects.
227 # When we're building modules with modversions, we need to consider
228 # the built-in objects during the descend as well, in order to
229 # make sure the checksums are up to date before we record them.
231 ifeq ($(MAKECMDGOALS
),modules
)
232 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
235 # If we have "make <whatever> modules", compile modules
236 # in addition to whatever we do anyway.
237 # Just "make" or "make all" shall build modules as well
239 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
243 ifeq ($(MAKECMDGOALS
),)
247 export KBUILD_MODULES KBUILD_BUILTIN
248 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
251 # ---------------------------------------------------------------------------
253 # Normally, we echo the whole command before executing it. By making
254 # that echo $($(quiet)$(cmd)), we now have the possibility to set
255 # $(quiet) to choose other forms of output instead, e.g.
257 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
258 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
260 # If $(quiet) is empty, the whole command will be printed.
261 # If it is set to "quiet_", only the short version will be printed.
262 # If it is set to "silent_", nothing will be printed at all, since
263 # the variable $(silent_cmd_cc_o_c) doesn't exist.
265 # A simple variant is to prefix commands with $(Q) - that's useful
266 # for commands that shall be hidden in non-verbose mode.
270 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
271 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
273 ifeq ($(KBUILD_VERBOSE
),1)
281 # If the user is running make -s (silent mode), suppress echoing of
284 ifneq ($(findstring s
,$(MAKEFLAGS
)),)
288 export quiet Q KBUILD_VERBOSE
291 # Look for make include files relative to root of kernel src
292 MAKEFLAGS
+= --include-dir
=$(srctree
)
294 # We need some generic definitions (do not try to remake the file).
295 $(srctree
)/scripts
/Kbuild.
include: ;
296 include $(srctree
)/scripts
/Kbuild.
include
298 # Make variables (CC, etc...)
300 AS
= $(CROSS_COMPILE
)as
301 LD
= $(CROSS_COMPILE
)ld
302 CC
= $(CROSS_COMPILE
)gcc
304 AR
= $(CROSS_COMPILE
)ar
305 NM
= $(CROSS_COMPILE
)nm
306 STRIP
= $(CROSS_COMPILE
)strip
307 OBJCOPY
= $(CROSS_COMPILE
)objcopy
308 OBJDUMP
= $(CROSS_COMPILE
)objdump
310 GENKSYMS
= scripts
/genksyms
/genksyms
311 DEPMOD
= /sbin
/depmod
312 KALLSYMS
= scripts
/kallsyms
316 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__
-Wbitwise
$(CF
)
318 CFLAGS_MODULE
= $(MODFLAGS
)
319 AFLAGS_MODULE
= $(MODFLAGS
)
325 # Use LINUXINCLUDE when you must reference the include/ directory.
326 # Needed to be compatible with the O= option
327 LINUXINCLUDE
:= -Iinclude \
328 $(if
$(KBUILD_SRC
),-Iinclude2
-I
$(srctree
)/include) \
329 -include include/linux
/autoconf.h
331 KBUILD_CPPFLAGS
:= -D__KERNEL__
$(LINUXINCLUDE
)
333 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
334 -fno-strict-aliasing
-fno-common \
335 -Werror-implicit-function-declaration
336 KBUILD_AFLAGS
:= -D__ASSEMBLY__
338 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
339 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
340 KERNELVERSION
= $(VERSION
).
$(PATCHLEVEL
).
$(SUBLEVEL
)$(EXTRAVERSION
)
342 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
343 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
344 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
345 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
347 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
348 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
349 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
351 # When compiling out-of-tree modules, put MODVERDIR in the module
352 # tree rather than in the kernel tree. The kernel tree might
354 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
356 # Files to ignore in find ... statements
358 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
359 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn
--exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
361 # ===========================================================================
362 # Rules shared between *config targets and build targets
364 # Basic helpers built in scripts/
365 PHONY
+= scripts_basic
367 $(Q
)$(MAKE
) $(build
)=scripts
/basic
369 # To avoid any implicit rule to kick in, define an empty command.
370 scripts
/basic
/%: scripts_basic
;
372 PHONY
+= outputmakefile
373 # outputmakefile generates a Makefile in the output directory, if using a
374 # separate output directory. This allows convenient use of make in the
377 ifneq ($(KBUILD_SRC
),)
378 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
379 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
382 # To make sure we do not include .config for any of the *config targets
383 # catch them early, and hand them over to scripts/kconfig/Makefile
384 # It is allowed to specify more targets when calling make, including
385 # mixing *config targets and build targets.
386 # For example 'make oldconfig all'.
387 # Detect when mixed targets is specified, and make a second invocation
388 # of make so .config is not included in this case either (for *config).
390 no-dot-config-targets
:= clean mrproper
distclean \
391 cscope TAGS
tags help
%docs
check% \
392 include/linux
/version.h headers_
% \
393 kernelrelease kernelversion
399 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
400 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
405 ifeq ($(KBUILD_EXTMOD
),)
406 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
408 ifneq ($(filter-out config
%config
,$(MAKECMDGOALS
)),)
414 ifeq ($(mixed-targets
),1)
415 # ===========================================================================
416 # We're called with mixed targets (*config and build targets).
417 # Handle them one by one.
420 $(Q
)$(MAKE
) -C
$(srctree
) KBUILD_SRC
= $@
423 ifeq ($(config-targets
),1)
424 # ===========================================================================
425 # *config targets only - make sure prerequisites are updated, and descend
426 # in scripts/kconfig to make the *config target
428 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
429 # KBUILD_DEFCONFIG may point out an alternative default configuration
430 # used for 'make defconfig'
431 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
432 export KBUILD_DEFCONFIG
434 config
%config
: scripts_basic outputmakefile FORCE
435 $(Q
)mkdir
-p
include/linux
include/config
436 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
439 # ===========================================================================
440 # Build targets only - this includes vmlinux, arch specific targets, clean
441 # targets and others. In general all targets except *config targets.
443 ifeq ($(KBUILD_EXTMOD
),)
444 # Additional helpers built in scripts/
445 # Carefully list dependencies so we do not try to build scripts twice
448 scripts
: scripts_basic
include/config
/auto.conf
449 $(Q
)$(MAKE
) $(build
)=$(@
)
451 # Objects we will link into vmlinux / subdirs we need to visit
453 drivers-y
:= drivers
/ sound
/ firmware
/
457 endif # KBUILD_EXTMOD
459 ifeq ($(dot-config
),1)
461 -include include/config
/auto.conf
463 ifeq ($(KBUILD_EXTMOD
),)
464 # Read in dependencies to all Kconfig* files, make sure to run
465 # oldconfig if changes are detected.
466 -include include/config
/auto.conf.cmd
468 # To avoid any implicit rule to kick in, define an empty command
469 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
471 # If .config is newer than include/config/auto.conf, someone tinkered
472 # with it and forgot to run make oldconfig.
473 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
474 # we execute the config step to be sure to catch updated Kconfig files
475 include/config
/auto.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
476 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
478 # external modules needs include/linux/autoconf.h and include/config/auto.conf
479 # but do not care if they are up-to-date. Use auto.conf to trigger the test
480 PHONY
+= include/config
/auto.conf
482 include/config
/auto.conf
:
483 $(Q
)test -e
include/linux
/autoconf.h
-a
-e
$@ ||
( \
485 echo
" ERROR: Kernel configuration is invalid."; \
486 echo
" include/linux/autoconf.h or $@ are missing."; \
487 echo
" Run 'make oldconfig && make prepare' on kernel src to fix it."; \
491 endif # KBUILD_EXTMOD
494 # Dummy target needed, because used as prerequisite
495 include/config
/auto.conf
: ;
496 endif # $(dot-config)
498 # The all: target is the default when no target is given on the
500 # This allow a user to issue only 'make' to build a kernel including modules
501 # Defaults vmlinux but it is usually overridden in the arch makefile
504 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
510 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
512 ifneq (CONFIG_FRAME_WARN
,0)
513 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
516 # Force gcc to behave correct even for buggy distributions
517 # Arch Makefiles may override this setting
518 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-protector
)
520 ifdef CONFIG_FRAME_POINTER
521 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
523 KBUILD_CFLAGS
+= -fomit-frame-pointer
526 ifdef CONFIG_DEBUG_INFO
528 KBUILD_AFLAGS
+= -gdwarf-2
535 # We trigger additional mismatches with less inlining
536 ifdef CONFIG_DEBUG_SECTION_MISMATCH
537 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
540 # arch Makefile may override CC so keep this after arch Makefile is included
541 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
542 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
544 # warn about C99 declaration after statement
545 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
547 # disable pointer signed / unsigned warnings in gcc 4.0
548 KBUILD_CFLAGS
+= $(call cc-option
,-Wno-pointer-sign
,)
550 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
551 # But warn user when we do so
553 $(warning
"WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
555 ifneq ($(KCPPFLAGS
),)
556 $(call warn-assign
,CPPFLAGS
)
557 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
560 $(call warn-assign
,AFLAGS
)
561 KBUILD_AFLAGS
+= $(KAFLAGS
)
564 $(call warn-assign
,CFLAGS
)
565 KBUILD_CFLAGS
+= $(KCFLAGS
)
568 # Use --build-id when available.
569 LDFLAGS_BUILD_ID
= $(patsubst -Wl
$(comma
)%,%,\
570 $(call ld-option
, -Wl
$(comma
)--build-id
,))
571 LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
572 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
574 # Default kernel image to build when no specific target is given.
575 # KBUILD_IMAGE may be overruled on the command line or
576 # set in the environment
577 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
579 export KBUILD_IMAGE ?
= vmlinux
582 # INSTALL_PATH specifies where to place the updated kernel and system map
583 # images. Default is /boot, but you can set it to other values
584 export INSTALL_PATH ?
= /boot
587 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
588 # relocations required by build roots. This is not defined in the
589 # makefile but the argument can be passed to make if needed.
592 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
596 # INSTALL_MOD_STRIP, if defined, will cause modules to be
597 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
598 # the default option --strip-debug will be used. Otherwise,
599 # INSTALL_MOD_STRIP will used as the options to the strip command.
601 ifdef INSTALL_MOD_STRIP
602 ifeq ($(INSTALL_MOD_STRIP
),1)
603 mod_strip_cmd
= $(STRIP
) --strip-debug
605 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
606 endif # INSTALL_MOD_STRIP=1
609 endif # INSTALL_MOD_STRIP
613 ifeq ($(KBUILD_EXTMOD
),)
614 core-y
+= kernel
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
616 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
617 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
618 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
)))
620 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
622 $(core-n
) $(core-
) $(drivers-n
) $(drivers-
) \
623 $(net-n
) $(net-
) $(libs-n
) $(libs-
))))
625 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
626 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
627 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
628 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
629 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
630 libs-y2
:= $(patsubst %/, %/built-in.o
, $(libs-y
))
631 libs-y
:= $(libs-y1
) $(libs-y2
)
634 # ---------------------------------------------------------------------------
635 # vmlinux is built from the objects selected by $(vmlinux-init) and
636 # $(vmlinux-main). Most are built-in.o files from top-level directories
637 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
638 # Ordering when linking is important, and $(vmlinux-init) must be first.
643 # +-< $(vmlinux-init)
644 # | +--< init/version.o + more
646 # +--< $(vmlinux-main)
647 # | +--< driver/built-in.o mm/built-in.o + more
649 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
651 # vmlinux version (uname -v) cannot be updated during normal
652 # descending-into-subdirs phase since we do not yet know if we need to
654 # Therefore this step is delayed until just before final link of vmlinux -
655 # except in the kallsyms case where it is done just before adding the
656 # symbols to the kernel.
658 # System.map is generated to document addresses of all kernel symbols
660 vmlinux-init
:= $(head-y
) $(init-y
)
661 vmlinux-main
:= $(core-y
) $(libs-y
) $(drivers-y
) $(net-y
)
662 vmlinux-all
:= $(vmlinux-init
) $(vmlinux-main
)
663 vmlinux-lds
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
664 export KBUILD_VMLINUX_OBJS
:= $(vmlinux-all
)
666 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
667 # May be overridden by arch/$(ARCH)/Makefile
668 quiet_cmd_vmlinux__ ?
= LD
$@
669 cmd_vmlinux__ ?
= $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) -o
$@ \
670 -T
$(vmlinux-lds
) $(vmlinux-init
) \
671 --start-group
$(vmlinux-main
) --end-group \
672 $(filter-out $(vmlinux-lds
) $(vmlinux-init
) $(vmlinux-main
) vmlinux.o FORCE
,$^
)
674 # Generate new vmlinux version
675 quiet_cmd_vmlinux_version
= GEN .version
676 cmd_vmlinux_version
= set
-e
; \
677 if
[ ! -r .version
]; then \
681 mv .version .old_version
; \
682 expr
0$$(cat .old_version
) + 1 >.version
; \
684 $(MAKE
) $(build
)=init
686 # Generate System.map
687 quiet_cmd_sysmap
= SYSMAP
688 cmd_sysmap
= $(CONFIG_SHELL
) $(srctree
)/scripts
/mksysmap
691 # If CONFIG_KALLSYMS is set .version is already updated
692 # Generate System.map and verify that the content is consistent
693 # Use + in front of the vmlinux_version rule to silent warning with make -j2
694 # First command is ':' to allow us to use + in front of the rule
695 define rule_vmlinux__
697 $(if
$(CONFIG_KALLSYMS
),,+$(call cmd
,vmlinux_version
))
699 $(call cmd
,vmlinux__
)
700 $(Q
)echo
'cmd_$@ := $(cmd_vmlinux__)' > $(@D
)/.
$(@F
).cmd
702 $(Q
)$(if
$($(quiet
)cmd_sysmap
), \
703 echo
' $($(quiet)cmd_sysmap) System.map' &&) \
704 $(cmd_sysmap
) $@ System.map
; \
705 if
[ $$?
-ne
0 ]; then \
713 ifdef CONFIG_KALLSYMS
714 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
715 # It's a three stage process:
716 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
718 # Running kallsyms on that gives us .tmp_kallsyms1.o with
719 # the right size - vmlinux version (uname -v) is updated during this step
720 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
721 # but due to the added section, some addresses have shifted.
722 # From here, we generate a correct .tmp_kallsyms2.o
723 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
724 # o Verify that the System.map from vmlinux matches the map from
725 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
726 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
727 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
728 # temporary bypass to allow the kernel to be built while the
729 # maintainers work out what went wrong with kallsyms.
731 ifdef CONFIG_KALLSYMS_EXTRA_PASS
737 kallsyms.o
:= .tmp_kallsyms
$(last_kallsyms
).o
739 define verify_kallsyms
740 $(Q
)$(if
$($(quiet
)cmd_sysmap
), \
741 echo
' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
742 $(cmd_sysmap
) .tmp_vmlinux
$(last_kallsyms
) .tmp_System.map
743 $(Q
)cmp
-s System.map .tmp_System.map || \
744 (echo Inconsistent kallsyms data
; \
745 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS
; \
746 rm .tmp_kallsyms
* ; /bin
/false
)
749 # Update vmlinux version before link
750 # Use + in front of this rule to silent warning about make -j1
751 # First command is ':' to allow us to use + in front of this rule
752 cmd_ksym_ld
= $(cmd_vmlinux__
)
755 +$(call cmd
,vmlinux_version
)
756 $(call cmd
,vmlinux__
)
757 $(Q
)echo
'cmd_$@ := $(cmd_vmlinux__)' > $(@D
)/.
$(@F
).cmd
760 # Generate .S file with all kernel symbols
761 quiet_cmd_kallsyms
= KSYM
$@
762 cmd_kallsyms
= $(NM
) -n
$< |
$(KALLSYMS
) \
763 $(if
$(CONFIG_KALLSYMS_ALL
),--all-symbols
) > $@
765 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o
: %.o
: %.S scripts FORCE
766 $(call if_changed_dep
,as_o_S
)
768 .tmp_kallsyms
%.S
: .tmp_vmlinux
% $(KALLSYMS
)
771 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
772 .tmp_vmlinux1
: $(vmlinux-lds
) $(vmlinux-all
) FORCE
773 $(call if_changed_rule
,ksym_ld
)
775 .tmp_vmlinux2
: $(vmlinux-lds
) $(vmlinux-all
) .tmp_kallsyms1.o FORCE
776 $(call if_changed
,vmlinux__
)
778 .tmp_vmlinux3
: $(vmlinux-lds
) $(vmlinux-all
) .tmp_kallsyms2.o FORCE
779 $(call if_changed
,vmlinux__
)
781 # Needs to visit scripts/ before $(KALLSYMS) can be used.
782 $(KALLSYMS
): scripts
;
784 # Generate some data for debugging strange kallsyms problems
785 debug_kallsyms
: .tmp_map
$(last_kallsyms
)
787 .tmp_map
%: .tmp_vmlinux
% FORCE
788 ($(OBJDUMP
) -h
$< |
$(AWK
) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM
) $<) |
sort > $@
794 endif # ifdef CONFIG_KALLSYMS
796 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
797 # relevant sections renamed as per the linker script.
798 quiet_cmd_vmlinux-modpost
= LD
$@
799 cmd_vmlinux-modpost
= $(LD
) $(LDFLAGS
) -r
-o
$@ \
800 $(vmlinux-init
) --start-group
$(vmlinux-main
) --end-group \
801 $(filter-out $(vmlinux-init
) $(vmlinux-main
) FORCE
,$^
)
802 define rule_vmlinux-modpost
804 +$(call cmd
,vmlinux-modpost
)
805 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
$@
806 $(Q
)echo
'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target
).cmd
809 # vmlinux image - including updated kernel symbols
810 vmlinux
: $(vmlinux-lds
) $(vmlinux-init
) $(vmlinux-main
) vmlinux.o
$(kallsyms.o
) FORCE
811 ifdef CONFIG_HEADERS_CHECK
812 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
815 $(Q
)$(MAKE
) $(build
)=samples
817 $(call vmlinux-modpost
)
818 $(call if_changed_rule
,vmlinux__
)
819 $(Q
)rm -f .old_version
821 # build vmlinux.o first to catch section mismatch errors early
822 ifdef CONFIG_KALLSYMS
823 .tmp_vmlinux1
: vmlinux.o
826 modpost-init
:= $(filter-out init
/built-in.o
, $(vmlinux-init
))
827 vmlinux.o
: $(modpost-init
) $(vmlinux-main
) FORCE
828 $(call if_changed_rule
,vmlinux-modpost
)
830 # The actual objects are generated when descending,
831 # make sure no implicit rule kicks in
832 $(sort $(vmlinux-init
) $(vmlinux-main
)) $(vmlinux-lds
): $(vmlinux-dirs
) ;
834 # Handle descending into subdirectories listed in $(vmlinux-dirs)
835 # Preset locale variables to speed up the build process. Limit locale
836 # tweaks to this spot to avoid wrong language settings when running
837 # make menuconfig etc.
838 # Error messages still appears in the original language
840 PHONY
+= $(vmlinux-dirs
)
841 $(vmlinux-dirs
): prepare scripts
842 $(Q
)$(MAKE
) $(build
)=$@
844 # Build the kernel release string
846 # The KERNELRELEASE value built here is stored in the file
847 # include/config/kernel.release, and is used when executing several
848 # make targets, such as "make install" or "make modules_install."
850 # The eventual kernel release string consists of the following fields,
851 # shown in a hierarchical format to show how smaller parts are concatenated
852 # to form the larger and final value, with values coming from places like
853 # the Makefile, kernel config options, make command line options and/or
854 # SCM tag information.
858 # $(PATCHLEVEL) eg, 6
860 # $(EXTRAVERSION) eg, -rc6
863 # localversion* (files without backups, containing '~')
864 # $(CONFIG_LOCALVERSION) (from kernel config setting)
865 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
866 # ./scripts/setlocalversion (SCM tag, if one exists)
867 # $(LOCALVERSION) (from make command line if provided)
869 # Note how the final $(localver-auto) string is included *only* if the
870 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
871 # moment, only git is supported but other SCMs can edit the script
872 # scripts/setlocalversion and add the appropriate checks as needed.
874 pattern
= ".*/localversion[^~]*"
875 string
= $(shell cat
/dev
/null \
876 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
878 localver
= $(subst $(space
),, $(string
) \
879 $(patsubst "%",%,$(CONFIG_LOCALVERSION
)))
881 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
882 # and if the SCM is know a tag from the SCM is appended.
883 # The appended tag is determined by the SCM used.
885 # Currently, only git is supported.
886 # Other SCMs can edit scripts/setlocalversion and add the appropriate
888 ifdef CONFIG_LOCALVERSION_AUTO
889 _localver-auto
= $(shell $(CONFIG_SHELL
) \
890 $(srctree
)/scripts
/setlocalversion
$(srctree
))
891 localver-auto
= $(LOCALVERSION
)$(_localver-auto
)
894 localver-full
= $(localver
)$(localver-auto
)
896 # Store (new) KERNELRELASE string in include/config/kernel.release
897 kernelrelease
= $(KERNELVERSION
)$(localver-full
)
898 include/config
/kernel.release
: include/config
/auto.conf FORCE
900 $(Q
)echo
$(kernelrelease
) > $@
903 # Things we need to do before we recursively start building the kernel
904 # or the modules are listed in "prepare".
905 # A multi level approach is used. prepareN is processed before prepareN-1.
906 # archprepare is used in arch Makefiles and when processed asm symlink,
907 # version.h and scripts_basic is processed / created.
909 # Listed in dependency order
910 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
912 # prepare3 is used to check if we are building in a separate output directory,
914 # 1) Check that make has not been executed in the kernel src $(srctree)
915 # 2) Create the include2 directory, used for the second asm symlink
916 prepare3
: include/config
/kernel.release
917 ifneq ($(KBUILD_SRC
),)
918 @echo
' Using $(srctree) as source for kernel'
919 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
920 echo
" $(srctree) is not clean, please run 'make mrproper'";\
921 echo
" in the '$(srctree)' directory.";\
924 $(Q
)if
[ ! -d include2
]; then mkdir
-p include2
; fi
;
925 $(Q
)ln
-fsn
$(srctree
)/include/asm-
$(SRCARCH
) include2
/asm
928 # prepare2 creates a makefile if using a separate output directory
929 prepare2
: prepare3 outputmakefile
931 prepare1
: prepare2
include/linux
/version.h
include/linux
/utsrelease.h \
932 include/asm
include/config
/auto.conf
935 archprepare
: prepare1 scripts_basic
937 prepare0
: archprepare FORCE
938 $(Q
)$(MAKE
) $(build
)=.
939 $(Q
)$(MAKE
) $(build
)=. missing-syscalls
941 # All the preparing..
944 # Leave this as default for preprocessing vmlinux.lds.S, which is now
945 # done in arch/$(ARCH)/kernel/Makefile
947 export CPPFLAGS_vmlinux.lds
+= -P
-C
-U
$(ARCH
)
949 # The asm symlink changes when $(ARCH) changes.
950 # Detect this and ask user to run make mrproper
953 $(Q
)set
-e
; asmlink
=`readlink include/asm | cut -d '-' -f 2`; \
954 if
[ -L
include/asm
]; then \
955 if
[ "$$asmlink" != "$(SRCARCH)" ]; then \
956 echo
"ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
957 echo
" set ARCH or save .config and run 'make mrproper' to fix it"; \
961 echo
' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
962 if
[ ! -d
include ]; then \
965 ln
-fsn asm-
$(SRCARCH
) $@
; \
968 # Generate some files
969 # ---------------------------------------------------------------------------
971 # KERNELRELEASE can change from a few different places, meaning version.h
972 # needs to be updated, so this check is forced on all builds
975 define filechk_utsrelease.h
976 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
977 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
980 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
983 define filechk_version.h
984 (echo \
#define LINUX_VERSION_CODE $(shell \
985 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + $(SUBLEVEL
)); \
986 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
989 include/linux
/version.h
: $(srctree
)/Makefile FORCE
990 $(call filechk
,version.h
)
992 include/linux
/utsrelease.h
: include/config
/kernel.release FORCE
993 $(call filechk
,utsrelease.h
)
995 # ---------------------------------------------------------------------------
999 @echo
'*** Warning: make $@ is unnecessary now.'
1001 # ---------------------------------------------------------------------------
1003 INSTALL_FW_PATH
=$(INSTALL_MOD_PATH
)/lib
/firmware
1004 export INSTALL_FW_PATH
1006 PHONY
+= firmware_install
1007 firmware_install
: FORCE
1008 @mkdir
-p
$(objtree
)/firmware
1009 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_install
1011 # ---------------------------------------------------------------------------
1013 INSTALL_HDR_PATH
=$(objtree
)/usr
1014 export INSTALL_HDR_PATH
1016 HDRFILTER
=generic i386 x86_64
1017 HDRARCHES
=$(filter-out $(HDRFILTER
),$(patsubst $(srctree
)/include/asm-
%/Kbuild
,%,$(wildcard $(srctree
)/include/asm-
*/Kbuild
)))
1019 PHONY
+= headers_install_all
1020 headers_install_all
: include/linux
/version.h scripts_basic FORCE
1021 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1022 $(Q
)for arch in
$(HDRARCHES
); do \
1023 $(MAKE
) ARCH
=$$arch -f
$(srctree
)/scripts
/Makefile.headersinst obj
=include BIASMDIR
=-bi-
$$arch ;\
1026 PHONY
+= headers_install
1027 headers_install
: include/linux
/version.h scripts_basic FORCE
1028 @if
[ ! -r
$(srctree
)/include/asm-
$(SRCARCH
)/Kbuild
]; then \
1029 echo
'*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
1031 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1032 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.headersinst ARCH
=$(SRCARCH
) obj
=include
1034 PHONY
+= headers_check_all
1035 headers_check_all
: headers_install_all
1036 $(Q
)for arch in
$(HDRARCHES
); do \
1037 $(MAKE
) ARCH
=$$arch -f
$(srctree
)/scripts
/Makefile.headersinst obj
=include BIASMDIR
=-bi-
$$arch HDRCHECK
=1 ;\
1040 PHONY
+= headers_check
1041 headers_check
: headers_install
1042 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.headersinst ARCH
=$(SRCARCH
) obj
=include HDRCHECK
=1
1044 # ---------------------------------------------------------------------------
1047 ifdef CONFIG_MODULES
1049 # By default, build modules as well
1055 # A module can be listed more than once in obj-m resulting in
1056 # duplicate lines in modules.order files. Those are removed
1057 # using awk while concatenating to the final file.
1060 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
)
1061 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1062 @echo
' Building modules, stage 2.';
1063 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1066 # Target to prepare building external modules
1067 PHONY
+= modules_prepare
1068 modules_prepare
: prepare scripts
1070 # Target to install modules
1071 PHONY
+= modules_install
1072 modules_install
: _modinst_ _modinst_post
1076 @if
[ -z
"`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1077 echo
"Warning: you may need to install module-init-tools"; \
1078 echo
"See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1081 @
rm -rf
$(MODLIB
)/kernel
1082 @
rm -f
$(MODLIB
)/source
1083 @mkdir
-p
$(MODLIB
)/kernel
1084 @ln
-s
$(srctree
) $(MODLIB
)/source
1085 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1086 rm -f
$(MODLIB
)/build
; \
1087 ln
-s
$(objtree
) $(MODLIB
)/build
; \
1089 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1090 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1092 # This depmod is only for convenience to give the initial
1093 # boot a modules.dep even before / is mounted read-write. However the
1094 # boot script depmod is the master version.
1095 PHONY
+= _modinst_post
1096 _modinst_post
: _modinst_
1097 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modinst
1100 else # CONFIG_MODULES
1102 # Modules not configured
1103 # ---------------------------------------------------------------------------
1105 modules modules_install
: FORCE
1107 @echo
"The present kernel configuration has modules disabled."
1108 @echo
"Type 'make config' and enable loadable module support."
1109 @echo
"Then build a kernel with module support enabled."
1113 endif # CONFIG_MODULES
1116 # Cleaning is done on three levels.
1117 # make clean Delete most generated files
1118 # Leave enough to build external modules
1119 # make mrproper Delete the current configuration, and all generated files
1120 # make distclean Remove editor backup files, patch leftover files and the like
1122 # Directories & files removed with 'make clean'
1123 CLEAN_DIRS
+= $(MODVERDIR
)
1124 CLEAN_FILES
+= vmlinux System.map \
1125 .tmp_kallsyms
* .tmp_version .tmp_vmlinux
* .tmp_System.map
1127 # Directories & files removed with 'make mrproper'
1128 MRPROPER_DIRS
+= include/config include2 usr
/include
1129 MRPROPER_FILES
+= .config .config.old
include/asm .version .old_version \
1130 include/linux
/autoconf.h
include/linux
/version.h \
1131 include/linux
/utsrelease.h \
1132 include/linux
/bounds.h
include/asm
*/asm-offsets.h \
1133 Module.symvers
tags TAGS cscope
*
1135 # clean - Delete most, but leave enough to build external modules
1137 clean: rm-dirs
:= $(CLEAN_DIRS
)
1138 clean: rm-files
:= $(CLEAN_FILES
)
1139 clean-dirs
:= $(addprefix _clean_
,$(srctree
) $(vmlinux-alldirs
))
1141 PHONY
+= $(clean-dirs
) clean archclean
1143 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1145 clean: archclean
$(clean-dirs
)
1148 @find .
$(RCS_FIND_IGNORE
) \
1149 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1150 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1151 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1152 -o
-name
'Module.markers' \
) \
1153 -type f
-print | xargs
rm -f
1155 # mrproper - Delete all generated files, including .config
1157 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1158 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1159 mrproper-dirs
:= $(addprefix _mrproper_
,Documentation
/DocBook scripts
)
1161 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1163 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1165 mrproper
: clean archmrproper
$(mrproper-dirs
)
1174 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1175 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1176 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'.*.orig' \
1177 -o
-name
'.*.rej' -o
-size
0 \
1178 -o
-name
'*%' -o
-name
'.*.cmd' -o
-name
'core' \
) \
1179 -type f
-print | xargs
rm -f
1182 # Packaging of the kernel to various formats
1183 # ---------------------------------------------------------------------------
1184 # rpm target kept for backward compatibility
1185 package-dir
:= $(srctree
)/scripts
/package
1187 %pkg
: include/config
/kernel.release FORCE
1188 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1189 rpm
: include/config
/kernel.release FORCE
1190 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1193 # Brief documentation of the typical targets used
1194 # ---------------------------------------------------------------------------
1196 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1197 boards
:= $(notdir $(boards
))
1198 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1199 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1202 @echo
'Cleaning targets:'
1203 @echo
' clean - Remove most generated files but keep the config and'
1204 @echo
' enough build support to build external modules'
1205 @echo
' mrproper - Remove all generated files + config + various backup files'
1206 @echo
' distclean - mrproper + remove editor backup and patch files'
1208 @echo
'Configuration targets:'
1209 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1211 @echo
'Other generic targets:'
1212 @echo
' all - Build all targets marked with [*]'
1213 @echo
'* vmlinux - Build the bare kernel'
1214 @echo
'* modules - Build all modules'
1215 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1216 @echo
' firmware_install- Install all firmware to INSTALL_FW_PATH'
1217 @echo
' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1218 @echo
' dir/ - Build all files in dir and below'
1219 @echo
' dir/file.[ois] - Build specified target only'
1220 @echo
' dir/file.ko - Build module including final link'
1221 @echo
' prepare - Set up for building external modules'
1222 @echo
' tags/TAGS - Generate tags file for editors'
1223 @echo
' cscope - Generate cscope index'
1224 @echo
' kernelrelease - Output the release version string'
1225 @echo
' kernelversion - Output the version stored in Makefile'
1226 @if
[ -r
$(srctree
)/include/asm-
$(SRCARCH
)/Kbuild
]; then \
1227 echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1228 echo
' (default: $(INSTALL_HDR_PATH))'; \
1231 @echo
'Static analysers'
1232 @echo
' checkstack - Generate a list of stack hogs'
1233 @echo
' namespacecheck - Name space analysis on compiled kernel'
1234 @echo
' versioncheck - Sanity check on version.h usage'
1235 @echo
' includecheck - Check for duplicate included header files'
1236 @echo
' export_report - List the usages of all exported symbols'
1237 @if
[ -r
$(srctree
)/include/asm-
$(SRCARCH
)/Kbuild
]; then \
1238 echo
' headers_check - Sanity check on exported headers'; \
1241 @echo
'Kernel packaging:'
1242 @
$(MAKE
) $(build
)=$(package-dir
) help
1244 @echo
'Documentation targets:'
1245 @
$(MAKE
) -f
$(srctree
)/Documentation
/DocBook
/Makefile dochelp
1247 @echo
'Architecture specific targets ($(SRCARCH)):'
1248 @
$(if
$(archhelp
),$(archhelp
),\
1249 echo
' No architecture specific help defined for $(SRCARCH)')
1252 $(foreach b
, $(boards
), \
1253 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1255 @
$(if
$(board-dirs
), \
1256 $(foreach b
, $(board-dirs
), \
1257 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1258 printf
" %-16s - Show all of the above\\n" help-boards
; \
1261 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1262 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1263 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1264 @echo
' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1265 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1267 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1268 @echo
'For further info see the ./README file'
1271 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1273 help-boards
: $(help-board-dirs
)
1275 boards-per-dir
= $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
))
1277 $(help-board-dirs
): help-
%:
1278 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1279 @
$(if
$(boards-per-dir
), \
1280 $(foreach b
, $(boards-per-dir
), \
1281 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1285 # Documentation targets
1286 # ---------------------------------------------------------------------------
1287 %docs
: scripts_basic FORCE
1288 $(Q
)$(MAKE
) $(build
)=Documentation
/DocBook
$@
1290 else # KBUILD_EXTMOD
1293 # External module support.
1294 # When building external modules the kernel used as basis is considered
1295 # read-only, and no consistency checks are made and the make
1296 # system is not used on the basis kernel. If updates are required
1297 # in the basis kernel ordinary make commands (without M=...) must
1300 # The following are the only valid targets when building external
1302 # make M=dir clean Delete all automatically generated files
1303 # make M=dir modules Make all modules in specified dir
1304 # make M=dir Same as 'make M=dir modules'
1305 # make M=dir modules_install
1306 # Install the modules built in the module directory
1307 # Assumes install directory is already created
1309 # We are always building modules
1311 PHONY
+= crmodverdir
1315 PHONY
+= $(objtree
)/Module.symvers
1316 $(objtree
)/Module.symvers
:
1317 @
test -e
$(objtree
)/Module.symvers ||
( \
1319 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1320 echo
" is missing; modules will have no dependencies and modversions."; \
1323 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1324 PHONY
+= $(module-dirs
) modules
1325 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1326 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1328 modules
: $(module-dirs
)
1329 @echo
' Building modules, stage 2.';
1330 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1332 PHONY
+= modules_install
1333 modules_install
: _emodinst_ _emodinst_post
1335 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1338 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1339 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1341 PHONY
+= _emodinst_post
1342 _emodinst_post
: _emodinst_
1345 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1347 PHONY
+= $(clean-dirs
) clean
1349 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1351 clean: rm-dirs
:= $(MODVERDIR
)
1352 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1353 clean: $(clean-dirs
)
1356 @find
$(KBUILD_EXTMOD
) $(RCS_FIND_IGNORE
) \
1357 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1358 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
) \
1359 -type f
-print | xargs
rm -f
1362 @echo
' Building external modules.'
1363 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1365 @echo
' modules - default target, build the module(s)'
1366 @echo
' modules_install - install the module'
1367 @echo
' clean - remove generated files in module directory only'
1371 PHONY
+= prepare scripts
1374 endif # KBUILD_EXTMOD
1376 # Generate tags for editors
1377 # ---------------------------------------------------------------------------
1379 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1380 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1381 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1383 ifeq ($(src
),$(obj
))
1386 __srctree
= $(srctree
)/
1389 ifeq ($(ALLSOURCE_ARCHS
),)
1391 ALLINCLUDE_ARCHS
:= $(ARCH
) $(SUBARCH
)
1393 ALLINCLUDE_ARCHS
:= $(SRCARCH
)
1396 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1397 ALLINCLUDE_ARCHS
:= $(ALLSOURCE_ARCHS
)
1400 ALLSOURCE_ARCHS
:= $(SRCARCH
)
1403 ( for arch in
$(ALLSOURCE_ARCHS
) ; do \
1404 find
$(__srctree
)arch
/$${arch} $(RCS_FIND_IGNORE
) \
1407 find
$(__srctree
)security
/selinux
/include $(RCS_FIND_IGNORE
) \
1409 find
$(__srctree
)include $(RCS_FIND_IGNORE
) \
1410 \
( -name config
-o
-name
'asm-*' \
) -prune \
1411 -o
-name
$1 -print; \
1412 for arch in
$(ALLINCLUDE_ARCHS
) ; do \
1413 find
$(__srctree
)include/asm-
$${arch} $(RCS_FIND_IGNORE
) \
1416 find
$(__srctree
)include/asm-generic
$(RCS_FIND_IGNORE
) \
1418 find
$(__srctree
) $(RCS_FIND_IGNORE
) \
1419 \
( -name
include -o
-name arch
-o
-name
'.tmp_*' \
) -prune
-o \
1425 $(call find-sources
,'*.[chS]')
1428 $(call find-sources
,'Kconfig*')
1430 define all-defconfigs
1431 $(call find-sources
,'defconfig')
1435 if
$1 --version
2>&1 | grep
-iq exuberant
; then \
1436 $(all-sources
) | xargs
$1 -a \
1437 -I __initdata
,__exitdata
,__acquires
,__releases \
1438 -I __read_mostly
,____cacheline_aligned
,____cacheline_aligned_in_smp
,____cacheline_internodealigned_in_smp \
1439 -I EXPORT_SYMBOL
,EXPORT_SYMBOL_GPL \
1440 --extra
=+f
--c-kinds
=+px \
1441 --regex-asm
='/^ENTRY\(([^)]*)\).*/\1/'; \
1442 $(all-kconfigs
) | xargs
$1 -a \
1444 --language-force
=kconfig \
1445 --regex-kconfig
='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/\2/'; \
1446 $(all-defconfigs
) | xargs
-r
$1 -a \
1447 --langdef
=dotconfig \
1448 --language-force
=dotconfig \
1449 --regex-dotconfig
='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1450 elif
$1 --version
2>&1 | grep
-iq emacs
; then \
1451 $(all-sources
) | xargs
$1 -a
; \
1452 $(all-kconfigs
) | xargs
$1 -a \
1453 --regex
='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'; \
1454 $(all-defconfigs
) | xargs
-r
$1 -a \
1455 --regex
='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1457 $(all-sources
) | xargs
$1 -a
; \
1461 quiet_cmd_cscope-file
= FILELST cscope.files
1462 cmd_cscope-file
= (echo \
-k
; echo \
-q
; $(all-sources
)) > cscope.files
1464 quiet_cmd_cscope
= MAKE cscope.out
1465 cmd_cscope
= cscope
-b
1468 $(call cmd
,cscope-file
)
1471 quiet_cmd_TAGS
= MAKE
$@
1480 quiet_cmd_tags
= MAKE
$@
1490 # Scripts to check various things for consistency
1491 # ---------------------------------------------------------------------------
1494 find
* $(RCS_FIND_IGNORE
) \
1495 -name
'*.[hcS]' -type f
-print |
sort \
1496 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1499 find
* $(RCS_FIND_IGNORE
) \
1500 -name
'*.[hcS]' -type f
-print |
sort \
1501 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1504 $(PERL
) $(srctree
)/scripts
/namespace.pl
1507 $(PERL
) $(srctree
)/scripts
/export_report.pl
1509 endif #ifeq ($(config-targets),1)
1510 endif #ifeq ($(mixed-targets),1)
1512 PHONY
+= checkstack kernelrelease kernelversion
1514 # UML needs a little special treatment here. It wants to use the host
1515 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1516 # else wants $(ARCH), including people doing cross-builds, which means
1517 # that $(SUBARCH) doesn't work here.
1519 CHECKSTACK_ARCH
:= $(SUBARCH
)
1521 CHECKSTACK_ARCH
:= $(ARCH
)
1524 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1525 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1528 $(if
$(wildcard include/config
/kernel.release
), $(Q
)echo
$(KERNELRELEASE
), \
1529 $(error kernelrelease not valid
- run
'make prepare' to update it
))
1531 @echo
$(KERNELVERSION
)
1534 # ---------------------------------------------------------------------------
1535 # Single targets are compatible with:
1536 # - build with mixed source and output
1537 # - build with separate output dir 'make O=...'
1538 # - external modules
1540 # target-dir => where to store outputfile
1541 # build-dir => directory in kernel source tree to use
1543 ifeq ($(KBUILD_EXTMOD
),)
1544 build-dir
= $(patsubst %/,%,$(dir $@
))
1545 target-dir
= $(dir $@
)
1547 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1548 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1549 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1552 %.s
: %.c prepare scripts FORCE
1553 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1554 %.i
: %.c prepare scripts FORCE
1555 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1556 %.o
: %.c prepare scripts FORCE
1557 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1558 %.lst
: %.c prepare scripts FORCE
1559 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1560 %.s
: %.S prepare scripts FORCE
1561 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1562 %.o
: %.S prepare scripts FORCE
1563 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1564 %.symtypes
: %.c prepare scripts FORCE
1565 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1568 / %/: prepare scripts FORCE
1570 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1571 $(build
)=$(build-dir
)
1572 %.ko
: prepare scripts FORCE
1574 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1575 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1576 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1578 # FIXME Should go into a make.lib or something
1579 # ===========================================================================
1581 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1582 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1584 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1585 cmd_rmfiles
= rm -f
$(rm-files
)
1587 # Run depmod only if we have System.map and depmod is executable
1588 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1590 if
[ -r System.map
-a
-x
$(DEPMOD
) ]; then \
1591 $(DEPMOD
) -ae
-F System.map \
1592 $(if
$(strip $(INSTALL_MOD_PATH
)), -b
$(INSTALL_MOD_PATH
) -r
) \
1596 # Create temporary dir for module support files
1597 # clean it up only when building all modules
1598 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1599 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1601 a_flags
= -Wp
,-MD
,$(depfile
) $(KBUILD_AFLAGS
) $(AFLAGS_KERNEL
) \
1602 $(NOSTDINC_FLAGS
) $(KBUILD_CPPFLAGS
) \
1603 $(modkern_aflags
) $(EXTRA_AFLAGS
) $(AFLAGS_
$(basetarget
).o
)
1605 quiet_cmd_as_o_S
= AS
$@
1606 cmd_as_o_S
= $(CC
) $(a_flags
) -c
-o
$@
$<
1608 # read all saved command lines
1610 targets
:= $(wildcard $(sort $(targets
)))
1611 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1613 ifneq ($(cmd_files
),)
1614 $(cmd_files
): ; # Do not try to update included dependency files
1615 include $(cmd_files
)
1618 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1620 # $(Q)$(MAKE) $(clean)=dir
1621 clean := -f
$(if
$(KBUILD_SRC
),$(srctree
)/)scripts
/Makefile.
clean obj
1623 endif # skip-makefile
1628 # Declare the contents of the .PHONY variable as phony. We keep that
1629 # information in a variable se we can use it in if_changed and friends.