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 # Where to locate arch specific headers
209 hdr-arch
:= $(SRCARCH
)
211 KCONFIG_CONFIG ?
= .config
213 # SHELL used by kbuild
214 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
215 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
216 else echo sh
; fi
; fi
)
220 HOSTCFLAGS
= -Wall
-Wstrict-prototypes
-O2
-fomit-frame-pointer
223 # Decide whether to build built-in, modular, or both.
224 # Normally, just do built-in.
229 # If we have only "make modules", don't compile built-in objects.
230 # When we're building modules with modversions, we need to consider
231 # the built-in objects during the descend as well, in order to
232 # make sure the checksums are up to date before we record them.
234 ifeq ($(MAKECMDGOALS
),modules
)
235 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
238 # If we have "make <whatever> modules", compile modules
239 # in addition to whatever we do anyway.
240 # Just "make" or "make all" shall build modules as well
242 ifneq ($(filter all _all modules
,$(MAKECMDGOALS
)),)
246 ifeq ($(MAKECMDGOALS
),)
250 export KBUILD_MODULES KBUILD_BUILTIN
251 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
254 # ---------------------------------------------------------------------------
256 # Normally, we echo the whole command before executing it. By making
257 # that echo $($(quiet)$(cmd)), we now have the possibility to set
258 # $(quiet) to choose other forms of output instead, e.g.
260 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
261 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
263 # If $(quiet) is empty, the whole command will be printed.
264 # If it is set to "quiet_", only the short version will be printed.
265 # If it is set to "silent_", nothing will be printed at all, since
266 # the variable $(silent_cmd_cc_o_c) doesn't exist.
268 # A simple variant is to prefix commands with $(Q) - that's useful
269 # for commands that shall be hidden in non-verbose mode.
273 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
274 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
276 ifeq ($(KBUILD_VERBOSE
),1)
284 # If the user is running make -s (silent mode), suppress echoing of
287 ifneq ($(findstring s
,$(MAKEFLAGS
)),)
291 export quiet Q KBUILD_VERBOSE
294 # Look for make include files relative to root of kernel src
295 MAKEFLAGS
+= --include-dir
=$(srctree
)
297 # We need some generic definitions (do not try to remake the file).
298 $(srctree
)/scripts
/Kbuild.
include: ;
299 include $(srctree
)/scripts
/Kbuild.
include
301 # Make variables (CC, etc...)
303 AS
= $(CROSS_COMPILE
)as
304 LD
= $(CROSS_COMPILE
)ld
305 CC
= $(CROSS_COMPILE
)gcc
307 AR
= $(CROSS_COMPILE
)ar
308 NM
= $(CROSS_COMPILE
)nm
309 STRIP
= $(CROSS_COMPILE
)strip
310 OBJCOPY
= $(CROSS_COMPILE
)objcopy
311 OBJDUMP
= $(CROSS_COMPILE
)objdump
313 GENKSYMS
= scripts
/genksyms
/genksyms
314 DEPMOD
= /sbin
/depmod
315 KALLSYMS
= scripts
/kallsyms
319 CHECKFLAGS
:= -D__linux__
-Dlinux
-D__STDC__
-Dunix
-D__unix__
-Wbitwise
$(CF
)
321 CFLAGS_MODULE
= $(MODFLAGS
)
322 AFLAGS_MODULE
= $(MODFLAGS
)
328 # Use LINUXINCLUDE when you must reference the include/ directory.
329 # Needed to be compatible with the O= option
330 LINUXINCLUDE
:= -Iinclude \
331 $(if
$(KBUILD_SRC
),-Iinclude2
-I
$(srctree
)/include) \
332 -include include/linux
/autoconf.h
334 KBUILD_CPPFLAGS
:= -D__KERNEL__
$(LINUXINCLUDE
)
336 KBUILD_CFLAGS
:= -Wall
-Wundef
-Wstrict-prototypes
-Wno-trigraphs \
337 -fno-strict-aliasing
-fno-common \
338 -Werror-implicit-function-declaration
339 KBUILD_AFLAGS
:= -D__ASSEMBLY__
341 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
342 KERNELRELEASE
= $(shell cat
include/config
/kernel.release
2> /dev
/null
)
343 KERNELVERSION
= $(VERSION
).
$(PATCHLEVEL
).
$(SUBLEVEL
)$(EXTRAVERSION
)
345 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
346 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
347 export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
348 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
350 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
351 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
352 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
354 # When compiling out-of-tree modules, put MODVERDIR in the module
355 # tree rather than in the kernel tree. The kernel tree might
357 export MODVERDIR
:= $(if
$(KBUILD_EXTMOD
),$(firstword $(KBUILD_EXTMOD
))/).tmp_versions
359 # Files to ignore in find ... statements
361 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
362 export RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn
--exclude CVS
--exclude .
pc --exclude .hg
--exclude .git
364 # ===========================================================================
365 # Rules shared between *config targets and build targets
367 # Basic helpers built in scripts/
368 PHONY
+= scripts_basic
370 $(Q
)$(MAKE
) $(build
)=scripts
/basic
372 # To avoid any implicit rule to kick in, define an empty command.
373 scripts
/basic
/%: scripts_basic
;
375 PHONY
+= outputmakefile
376 # outputmakefile generates a Makefile in the output directory, if using a
377 # separate output directory. This allows convenient use of make in the
380 ifneq ($(KBUILD_SRC
),)
381 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/mkmakefile \
382 $(srctree
) $(objtree
) $(VERSION
) $(PATCHLEVEL
)
385 # To make sure we do not include .config for any of the *config targets
386 # catch them early, and hand them over to scripts/kconfig/Makefile
387 # It is allowed to specify more targets when calling make, including
388 # mixing *config targets and build targets.
389 # For example 'make oldconfig all'.
390 # Detect when mixed targets is specified, and make a second invocation
391 # of make so .config is not included in this case either (for *config).
393 no-dot-config-targets
:= clean mrproper
distclean \
394 cscope TAGS
tags help
%docs
check% \
395 include/linux
/version.h headers_
% \
396 kernelrelease kernelversion
402 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
403 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
408 ifeq ($(KBUILD_EXTMOD
),)
409 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
411 ifneq ($(filter-out config
%config
,$(MAKECMDGOALS
)),)
417 ifeq ($(mixed-targets
),1)
418 # ===========================================================================
419 # We're called with mixed targets (*config and build targets).
420 # Handle them one by one.
423 $(Q
)$(MAKE
) -C
$(srctree
) KBUILD_SRC
= $@
426 ifeq ($(config-targets
),1)
427 # ===========================================================================
428 # *config targets only - make sure prerequisites are updated, and descend
429 # in scripts/kconfig to make the *config target
431 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
432 # KBUILD_DEFCONFIG may point out an alternative default configuration
433 # used for 'make defconfig'
434 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
435 export KBUILD_DEFCONFIG
437 config
%config
: scripts_basic outputmakefile FORCE
438 $(Q
)mkdir
-p
include/linux
include/config
439 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
442 # ===========================================================================
443 # Build targets only - this includes vmlinux, arch specific targets, clean
444 # targets and others. In general all targets except *config targets.
446 ifeq ($(KBUILD_EXTMOD
),)
447 # Additional helpers built in scripts/
448 # Carefully list dependencies so we do not try to build scripts twice
451 scripts
: scripts_basic
include/config
/auto.conf
452 $(Q
)$(MAKE
) $(build
)=$(@
)
454 # Objects we will link into vmlinux / subdirs we need to visit
456 drivers-y
:= drivers
/ sound
/ firmware
/
460 endif # KBUILD_EXTMOD
462 ifeq ($(dot-config
),1)
464 -include include/config
/auto.conf
466 ifeq ($(KBUILD_EXTMOD
),)
467 # Read in dependencies to all Kconfig* files, make sure to run
468 # oldconfig if changes are detected.
469 -include include/config
/auto.conf.cmd
471 # To avoid any implicit rule to kick in, define an empty command
472 $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
: ;
474 # If .config is newer than include/config/auto.conf, someone tinkered
475 # with it and forgot to run make oldconfig.
476 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
477 # we execute the config step to be sure to catch updated Kconfig files
478 include/config
/auto.conf
: $(KCONFIG_CONFIG
) include/config
/auto.conf.cmd
479 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
481 # external modules needs include/linux/autoconf.h and include/config/auto.conf
482 # but do not care if they are up-to-date. Use auto.conf to trigger the test
483 PHONY
+= include/config
/auto.conf
485 include/config
/auto.conf
:
486 $(Q
)test -e
include/linux
/autoconf.h
-a
-e
$@ ||
( \
488 echo
" ERROR: Kernel configuration is invalid."; \
489 echo
" include/linux/autoconf.h or $@ are missing."; \
490 echo
" Run 'make oldconfig && make prepare' on kernel src to fix it."; \
494 endif # KBUILD_EXTMOD
497 # Dummy target needed, because used as prerequisite
498 include/config
/auto.conf
: ;
499 endif # $(dot-config)
501 # The all: target is the default when no target is given on the
503 # This allow a user to issue only 'make' to build a kernel including modules
504 # Defaults vmlinux but it is usually overridden in the arch makefile
507 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
513 include $(srctree
)/arch
/$(SRCARCH
)/Makefile
515 ifneq (CONFIG_FRAME_WARN
,0)
516 KBUILD_CFLAGS
+= $(call cc-option
,-Wframe-larger-than
=${CONFIG_FRAME_WARN})
519 # Force gcc to behave correct even for buggy distributions
520 # Arch Makefiles may override this setting
521 KBUILD_CFLAGS
+= $(call cc-option
, -fno-stack-protector
)
523 ifdef CONFIG_FRAME_POINTER
524 KBUILD_CFLAGS
+= -fno-omit-frame-pointer
-fno-optimize-sibling-calls
526 KBUILD_CFLAGS
+= -fomit-frame-pointer
529 ifdef CONFIG_DEBUG_INFO
531 KBUILD_AFLAGS
+= -gdwarf-2
538 # We trigger additional mismatches with less inlining
539 ifdef CONFIG_DEBUG_SECTION_MISMATCH
540 KBUILD_CFLAGS
+= $(call cc-option
, -fno-inline-functions-called-once
)
543 # arch Makefile may override CC so keep this after arch Makefile is included
544 NOSTDINC_FLAGS
+= -nostdinc
-isystem
$(shell $(CC
) -print-file-name
=include)
545 CHECKFLAGS
+= $(NOSTDINC_FLAGS
)
547 # warn about C99 declaration after statement
548 KBUILD_CFLAGS
+= $(call cc-option
,-Wdeclaration-after-statement
,)
550 # disable pointer signed / unsigned warnings in gcc 4.0
551 KBUILD_CFLAGS
+= $(call cc-option
,-Wno-pointer-sign
,)
553 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
554 # But warn user when we do so
556 $(warning
"WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
558 ifneq ($(KCPPFLAGS
),)
559 $(call warn-assign
,CPPFLAGS
)
560 KBUILD_CPPFLAGS
+= $(KCPPFLAGS
)
563 $(call warn-assign
,AFLAGS
)
564 KBUILD_AFLAGS
+= $(KAFLAGS
)
567 $(call warn-assign
,CFLAGS
)
568 KBUILD_CFLAGS
+= $(KCFLAGS
)
571 # Use --build-id when available.
572 LDFLAGS_BUILD_ID
= $(patsubst -Wl
$(comma
)%,%,\
573 $(call ld-option
, -Wl
$(comma
)--build-id
,))
574 LDFLAGS_MODULE
+= $(LDFLAGS_BUILD_ID
)
575 LDFLAGS_vmlinux
+= $(LDFLAGS_BUILD_ID
)
577 # Default kernel image to build when no specific target is given.
578 # KBUILD_IMAGE may be overruled on the command line or
579 # set in the environment
580 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
582 export KBUILD_IMAGE ?
= vmlinux
585 # INSTALL_PATH specifies where to place the updated kernel and system map
586 # images. Default is /boot, but you can set it to other values
587 export INSTALL_PATH ?
= /boot
590 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
591 # relocations required by build roots. This is not defined in the
592 # makefile but the argument can be passed to make if needed.
595 MODLIB
= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
599 # INSTALL_MOD_STRIP, if defined, will cause modules to be
600 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
601 # the default option --strip-debug will be used. Otherwise,
602 # INSTALL_MOD_STRIP will used as the options to the strip command.
604 ifdef INSTALL_MOD_STRIP
605 ifeq ($(INSTALL_MOD_STRIP
),1)
606 mod_strip_cmd
= $(STRIP
) --strip-debug
608 mod_strip_cmd
= $(STRIP
) $(INSTALL_MOD_STRIP
)
609 endif # INSTALL_MOD_STRIP=1
612 endif # INSTALL_MOD_STRIP
616 ifeq ($(KBUILD_EXTMOD
),)
617 core-y
+= kernel
/ mm
/ fs
/ ipc
/ security
/ crypto
/ block
/
619 vmlinux-dirs
:= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
620 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
621 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
)))
623 vmlinux-alldirs
:= $(sort $(vmlinux-dirs
) $(patsubst %/,%,$(filter %/, \
625 $(core-n
) $(core-
) $(drivers-n
) $(drivers-
) \
626 $(net-n
) $(net-
) $(libs-n
) $(libs-
))))
628 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
629 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
630 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
631 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
632 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
633 libs-y2
:= $(patsubst %/, %/built-in.o
, $(libs-y
))
634 libs-y
:= $(libs-y1
) $(libs-y2
)
637 # ---------------------------------------------------------------------------
638 # vmlinux is built from the objects selected by $(vmlinux-init) and
639 # $(vmlinux-main). Most are built-in.o files from top-level directories
640 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
641 # Ordering when linking is important, and $(vmlinux-init) must be first.
646 # +-< $(vmlinux-init)
647 # | +--< init/version.o + more
649 # +--< $(vmlinux-main)
650 # | +--< driver/built-in.o mm/built-in.o + more
652 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
654 # vmlinux version (uname -v) cannot be updated during normal
655 # descending-into-subdirs phase since we do not yet know if we need to
657 # Therefore this step is delayed until just before final link of vmlinux -
658 # except in the kallsyms case where it is done just before adding the
659 # symbols to the kernel.
661 # System.map is generated to document addresses of all kernel symbols
663 vmlinux-init
:= $(head-y
) $(init-y
)
664 vmlinux-main
:= $(core-y
) $(libs-y
) $(drivers-y
) $(net-y
)
665 vmlinux-all
:= $(vmlinux-init
) $(vmlinux-main
)
666 vmlinux-lds
:= arch
/$(SRCARCH
)/kernel
/vmlinux.lds
667 export KBUILD_VMLINUX_OBJS
:= $(vmlinux-all
)
669 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
670 # May be overridden by arch/$(ARCH)/Makefile
671 quiet_cmd_vmlinux__ ?
= LD
$@
672 cmd_vmlinux__ ?
= $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) -o
$@ \
673 -T
$(vmlinux-lds
) $(vmlinux-init
) \
674 --start-group
$(vmlinux-main
) --end-group \
675 $(filter-out $(vmlinux-lds
) $(vmlinux-init
) $(vmlinux-main
) vmlinux.o FORCE
,$^
)
677 # Generate new vmlinux version
678 quiet_cmd_vmlinux_version
= GEN .version
679 cmd_vmlinux_version
= set
-e
; \
680 if
[ ! -r .version
]; then \
684 mv .version .old_version
; \
685 expr
0$$(cat .old_version
) + 1 >.version
; \
687 $(MAKE
) $(build
)=init
689 # Generate System.map
690 quiet_cmd_sysmap
= SYSMAP
691 cmd_sysmap
= $(CONFIG_SHELL
) $(srctree
)/scripts
/mksysmap
694 # If CONFIG_KALLSYMS is set .version is already updated
695 # Generate System.map and verify that the content is consistent
696 # Use + in front of the vmlinux_version rule to silent warning with make -j2
697 # First command is ':' to allow us to use + in front of the rule
698 define rule_vmlinux__
700 $(if
$(CONFIG_KALLSYMS
),,+$(call cmd
,vmlinux_version
))
702 $(call cmd
,vmlinux__
)
703 $(Q
)echo
'cmd_$@ := $(cmd_vmlinux__)' > $(@D
)/.
$(@F
).cmd
705 $(Q
)$(if
$($(quiet
)cmd_sysmap
), \
706 echo
' $($(quiet)cmd_sysmap) System.map' &&) \
707 $(cmd_sysmap
) $@ System.map
; \
708 if
[ $$?
-ne
0 ]; then \
716 ifdef CONFIG_KALLSYMS
717 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
718 # It's a three stage process:
719 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
721 # Running kallsyms on that gives us .tmp_kallsyms1.o with
722 # the right size - vmlinux version (uname -v) is updated during this step
723 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
724 # but due to the added section, some addresses have shifted.
725 # From here, we generate a correct .tmp_kallsyms2.o
726 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
727 # o Verify that the System.map from vmlinux matches the map from
728 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
729 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
730 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
731 # temporary bypass to allow the kernel to be built while the
732 # maintainers work out what went wrong with kallsyms.
734 ifdef CONFIG_KALLSYMS_EXTRA_PASS
740 kallsyms.o
:= .tmp_kallsyms
$(last_kallsyms
).o
742 define verify_kallsyms
743 $(Q
)$(if
$($(quiet
)cmd_sysmap
), \
744 echo
' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
745 $(cmd_sysmap
) .tmp_vmlinux
$(last_kallsyms
) .tmp_System.map
746 $(Q
)cmp
-s System.map .tmp_System.map || \
747 (echo Inconsistent kallsyms data
; \
748 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS
; \
749 rm .tmp_kallsyms
* ; /bin
/false
)
752 # Update vmlinux version before link
753 # Use + in front of this rule to silent warning about make -j1
754 # First command is ':' to allow us to use + in front of this rule
755 cmd_ksym_ld
= $(cmd_vmlinux__
)
758 +$(call cmd
,vmlinux_version
)
759 $(call cmd
,vmlinux__
)
760 $(Q
)echo
'cmd_$@ := $(cmd_vmlinux__)' > $(@D
)/.
$(@F
).cmd
763 # Generate .S file with all kernel symbols
764 quiet_cmd_kallsyms
= KSYM
$@
765 cmd_kallsyms
= $(NM
) -n
$< |
$(KALLSYMS
) \
766 $(if
$(CONFIG_KALLSYMS_ALL
),--all-symbols
) > $@
768 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o
: %.o
: %.S scripts FORCE
769 $(call if_changed_dep
,as_o_S
)
771 .tmp_kallsyms
%.S
: .tmp_vmlinux
% $(KALLSYMS
)
774 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
775 .tmp_vmlinux1
: $(vmlinux-lds
) $(vmlinux-all
) FORCE
776 $(call if_changed_rule
,ksym_ld
)
778 .tmp_vmlinux2
: $(vmlinux-lds
) $(vmlinux-all
) .tmp_kallsyms1.o FORCE
779 $(call if_changed
,vmlinux__
)
781 .tmp_vmlinux3
: $(vmlinux-lds
) $(vmlinux-all
) .tmp_kallsyms2.o FORCE
782 $(call if_changed
,vmlinux__
)
784 # Needs to visit scripts/ before $(KALLSYMS) can be used.
785 $(KALLSYMS
): scripts
;
787 # Generate some data for debugging strange kallsyms problems
788 debug_kallsyms
: .tmp_map
$(last_kallsyms
)
790 .tmp_map
%: .tmp_vmlinux
% FORCE
791 ($(OBJDUMP
) -h
$< |
$(AWK
) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM
) $<) |
sort > $@
797 endif # ifdef CONFIG_KALLSYMS
799 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
800 # relevant sections renamed as per the linker script.
801 quiet_cmd_vmlinux-modpost
= LD
$@
802 cmd_vmlinux-modpost
= $(LD
) $(LDFLAGS
) -r
-o
$@ \
803 $(vmlinux-init
) --start-group
$(vmlinux-main
) --end-group \
804 $(filter-out $(vmlinux-init
) $(vmlinux-main
) FORCE
,$^
)
805 define rule_vmlinux-modpost
807 +$(call cmd
,vmlinux-modpost
)
808 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
$@
809 $(Q
)echo
'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target
).cmd
812 # vmlinux image - including updated kernel symbols
813 vmlinux
: $(vmlinux-lds
) $(vmlinux-init
) $(vmlinux-main
) vmlinux.o
$(kallsyms.o
) FORCE
814 ifdef CONFIG_HEADERS_CHECK
815 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile headers_check
818 $(Q
)$(MAKE
) $(build
)=samples
820 $(call vmlinux-modpost
)
821 $(call if_changed_rule
,vmlinux__
)
822 $(Q
)rm -f .old_version
824 # build vmlinux.o first to catch section mismatch errors early
825 ifdef CONFIG_KALLSYMS
826 .tmp_vmlinux1
: vmlinux.o
829 modpost-init
:= $(filter-out init
/built-in.o
, $(vmlinux-init
))
830 vmlinux.o
: $(modpost-init
) $(vmlinux-main
) FORCE
831 $(call if_changed_rule
,vmlinux-modpost
)
833 # The actual objects are generated when descending,
834 # make sure no implicit rule kicks in
835 $(sort $(vmlinux-init
) $(vmlinux-main
)) $(vmlinux-lds
): $(vmlinux-dirs
) ;
837 # Handle descending into subdirectories listed in $(vmlinux-dirs)
838 # Preset locale variables to speed up the build process. Limit locale
839 # tweaks to this spot to avoid wrong language settings when running
840 # make menuconfig etc.
841 # Error messages still appears in the original language
843 PHONY
+= $(vmlinux-dirs
)
844 $(vmlinux-dirs
): prepare scripts
845 $(Q
)$(MAKE
) $(build
)=$@
847 # Build the kernel release string
849 # The KERNELRELEASE value built here is stored in the file
850 # include/config/kernel.release, and is used when executing several
851 # make targets, such as "make install" or "make modules_install."
853 # The eventual kernel release string consists of the following fields,
854 # shown in a hierarchical format to show how smaller parts are concatenated
855 # to form the larger and final value, with values coming from places like
856 # the Makefile, kernel config options, make command line options and/or
857 # SCM tag information.
861 # $(PATCHLEVEL) eg, 6
863 # $(EXTRAVERSION) eg, -rc6
866 # localversion* (files without backups, containing '~')
867 # $(CONFIG_LOCALVERSION) (from kernel config setting)
868 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
869 # ./scripts/setlocalversion (SCM tag, if one exists)
870 # $(LOCALVERSION) (from make command line if provided)
872 # Note how the final $(localver-auto) string is included *only* if the
873 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
874 # moment, only git is supported but other SCMs can edit the script
875 # scripts/setlocalversion and add the appropriate checks as needed.
877 pattern
= ".*/localversion[^~]*"
878 string
= $(shell cat
/dev
/null \
879 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
881 localver
= $(subst $(space
),, $(string
) \
882 $(patsubst "%",%,$(CONFIG_LOCALVERSION
)))
884 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
885 # and if the SCM is know a tag from the SCM is appended.
886 # The appended tag is determined by the SCM used.
888 # Currently, only git is supported.
889 # Other SCMs can edit scripts/setlocalversion and add the appropriate
891 ifdef CONFIG_LOCALVERSION_AUTO
892 _localver-auto
= $(shell $(CONFIG_SHELL
) \
893 $(srctree
)/scripts
/setlocalversion
$(srctree
))
894 localver-auto
= $(LOCALVERSION
)$(_localver-auto
)
897 localver-full
= $(localver
)$(localver-auto
)
899 # Store (new) KERNELRELASE string in include/config/kernel.release
900 kernelrelease
= $(KERNELVERSION
)$(localver-full
)
901 include/config
/kernel.release
: include/config
/auto.conf FORCE
903 $(Q
)echo
$(kernelrelease
) > $@
906 # Things we need to do before we recursively start building the kernel
907 # or the modules are listed in "prepare".
908 # A multi level approach is used. prepareN is processed before prepareN-1.
909 # archprepare is used in arch Makefiles and when processed asm symlink,
910 # version.h and scripts_basic is processed / created.
912 # Listed in dependency order
913 PHONY
+= prepare archprepare prepare0 prepare1 prepare2 prepare3
915 # prepare3 is used to check if we are building in a separate output directory,
917 # 1) Check that make has not been executed in the kernel src $(srctree)
918 # 2) Create the include2 directory, used for the second asm symlink
919 prepare3
: include/config
/kernel.release
920 ifneq ($(KBUILD_SRC
),)
921 @echo
' Using $(srctree) as source for kernel'
922 $(Q
)if
[ -f
$(srctree
)/.config
-o
-d
$(srctree
)/include/config
]; then \
923 echo
" $(srctree) is not clean, please run 'make mrproper'";\
924 echo
" in the '$(srctree)' directory.";\
927 $(Q
)if
[ ! -d include2
]; then mkdir
-p include2
; fi
;
928 $(Q
)ln
-fsn
$(srctree
)/include/asm-
$(SRCARCH
) include2
/asm
931 # prepare2 creates a makefile if using a separate output directory
932 prepare2
: prepare3 outputmakefile
934 prepare1
: prepare2
include/linux
/version.h
include/linux
/utsrelease.h \
935 include/asm
include/config
/auto.conf
938 archprepare
: prepare1 scripts_basic
940 prepare0
: archprepare FORCE
941 $(Q
)$(MAKE
) $(build
)=.
942 $(Q
)$(MAKE
) $(build
)=. missing-syscalls
944 # All the preparing..
947 # Leave this as default for preprocessing vmlinux.lds.S, which is now
948 # done in arch/$(ARCH)/kernel/Makefile
950 export CPPFLAGS_vmlinux.lds
+= -P
-C
-U
$(ARCH
)
952 # The asm symlink changes when $(ARCH) changes.
953 # Detect this and ask user to run make mrproper
956 $(Q
)set
-e
; asmlink
=`readlink include/asm | cut -d '-' -f 2`; \
957 if
[ -L
include/asm
]; then \
958 if
[ "$$asmlink" != "$(SRCARCH)" ]; then \
959 echo
"ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
960 echo
" set ARCH or save .config and run 'make mrproper' to fix it"; \
964 echo
' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
965 if
[ ! -d
include ]; then \
968 ln
-fsn asm-
$(SRCARCH
) $@
; \
971 # Generate some files
972 # ---------------------------------------------------------------------------
974 # KERNELRELEASE can change from a few different places, meaning version.h
975 # needs to be updated, so this check is forced on all builds
978 define filechk_utsrelease.h
979 if
[ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt
$(uts_len
) ]; then \
980 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
983 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\";)
986 define filechk_version.h
987 (echo \
#define LINUX_VERSION_CODE $(shell \
988 expr
$(VERSION
) \
* 65536 + $(PATCHLEVEL
) \
* 256 + $(SUBLEVEL
)); \
989 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
992 include/linux
/version.h
: $(srctree
)/Makefile FORCE
993 $(call filechk
,version.h
)
995 include/linux
/utsrelease.h
: include/config
/kernel.release FORCE
996 $(call filechk
,utsrelease.h
)
998 # ---------------------------------------------------------------------------
1002 @echo
'*** Warning: make $@ is unnecessary now.'
1004 # ---------------------------------------------------------------------------
1006 INSTALL_FW_PATH
=$(INSTALL_MOD_PATH
)/lib
/firmware
1007 export INSTALL_FW_PATH
1009 PHONY
+= firmware_install
1010 firmware_install
: FORCE
1011 @mkdir
-p
$(objtree
)/firmware
1012 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_install
1014 # ---------------------------------------------------------------------------
1017 #Default location for installed headers
1018 export INSTALL_HDR_PATH
= $(objtree
)/usr
1020 hdr-inst
:= -rR
-f
$(srctree
)/scripts
/Makefile.headersinst obj
1021 # Find out where the Kbuild file is located to support
1022 # arch/$(ARCH)/include/asm
1024 $(if
$(wildcard $(srctree
)/arch
/$(hdr-arch
)/include/asm
/Kbuild
), \
1025 arch
/$(hdr-arch
)/include/asm
, include/asm-
$(hdr-arch
)))
1027 # If we do an all arch process set dst to asm-$(hdr-arch)
1028 hdr-dst
= $(if
$(KBUILD_HEADERS
), dst
=include/asm-
$(hdr-arch
), dst
=include/asm
)
1031 __headers
: include/linux
/version.h scripts_basic FORCE
1032 $(Q
)$(MAKE
) $(build
)=scripts scripts
/unifdef
1034 PHONY
+= headers_install_all
1035 headers_install_all
:
1036 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
install
1038 PHONY
+= headers_install
1039 headers_install
: __headers
1040 $(if
$(wildcard $(srctree
)/$(hdr-dir
)/Kbuild
),, \
1041 $(error Headers not exportable for the
$(SRCARCH
) architecture
))
1042 $(Q
)$(MAKE
) $(hdr-inst
)=include
1043 $(Q
)$(MAKE
) $(hdr-inst
)=$(hdr-dir
) $(hdr-dst
)
1045 PHONY
+= headers_check_all
1046 headers_check_all
: headers_install_all
1047 $(Q
)$(CONFIG_SHELL
) $(srctree
)/scripts
/headers.sh
check
1049 PHONY
+= headers_check
1050 headers_check
: headers_install
1051 $(Q
)$(MAKE
) $(hdr-inst
)=include HDRCHECK
=1
1052 $(Q
)$(MAKE
) $(hdr-inst
)=$(hdr-dir
) $(hdr-dst
) HDRCHECK
=1
1054 # ---------------------------------------------------------------------------
1057 ifdef CONFIG_MODULES
1059 # By default, build modules as well
1065 # A module can be listed more than once in obj-m resulting in
1066 # duplicate lines in modules.order files. Those are removed
1067 # using awk while concatenating to the final file.
1070 modules
: $(vmlinux-dirs
) $(if
$(KBUILD_BUILTIN
),vmlinux
)
1071 $(Q
)$(AWK
) '!x[$$0]++' $(vmlinux-dirs
:%=$(objtree
)/%/modules.order
) > $(objtree
)/modules.order
1072 @echo
' Building modules, stage 2.';
1073 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1076 # Target to prepare building external modules
1077 PHONY
+= modules_prepare
1078 modules_prepare
: prepare scripts
1080 # Target to install modules
1081 PHONY
+= modules_install
1082 modules_install
: _modinst_ _modinst_post
1086 @if
[ -z
"`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1087 echo
"Warning: you may need to install module-init-tools"; \
1088 echo
"See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1091 @
rm -rf
$(MODLIB
)/kernel
1092 @
rm -f
$(MODLIB
)/source
1093 @mkdir
-p
$(MODLIB
)/kernel
1094 @ln
-s
$(srctree
) $(MODLIB
)/source
1095 @if
[ ! $(objtree
) -ef
$(MODLIB
)/build
]; then \
1096 rm -f
$(MODLIB
)/build
; \
1097 ln
-s
$(objtree
) $(MODLIB
)/build
; \
1099 @cp
-f
$(objtree
)/modules.order
$(MODLIB
)/
1100 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1102 # This depmod is only for convenience to give the initial
1103 # boot a modules.dep even before / is mounted read-write. However the
1104 # boot script depmod is the master version.
1105 PHONY
+= _modinst_post
1106 _modinst_post
: _modinst_
1107 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.fwinst obj
=firmware __fw_modinst
1110 else # CONFIG_MODULES
1112 # Modules not configured
1113 # ---------------------------------------------------------------------------
1115 modules modules_install
: FORCE
1117 @echo
"The present kernel configuration has modules disabled."
1118 @echo
"Type 'make config' and enable loadable module support."
1119 @echo
"Then build a kernel with module support enabled."
1123 endif # CONFIG_MODULES
1126 # Cleaning is done on three levels.
1127 # make clean Delete most generated files
1128 # Leave enough to build external modules
1129 # make mrproper Delete the current configuration, and all generated files
1130 # make distclean Remove editor backup files, patch leftover files and the like
1132 # Directories & files removed with 'make clean'
1133 CLEAN_DIRS
+= $(MODVERDIR
)
1134 CLEAN_FILES
+= vmlinux System.map \
1135 .tmp_kallsyms
* .tmp_version .tmp_vmlinux
* .tmp_System.map
1137 # Directories & files removed with 'make mrproper'
1138 MRPROPER_DIRS
+= include/config include2 usr
/include
1139 MRPROPER_FILES
+= .config .config.old
include/asm .version .old_version \
1140 include/linux
/autoconf.h
include/linux
/version.h \
1141 include/linux
/utsrelease.h \
1142 include/linux
/bounds.h
include/asm
*/asm-offsets.h \
1143 Module.symvers
tags TAGS cscope
*
1145 # clean - Delete most, but leave enough to build external modules
1147 clean: rm-dirs
:= $(CLEAN_DIRS
)
1148 clean: rm-files
:= $(CLEAN_FILES
)
1149 clean-dirs
:= $(addprefix _clean_
,$(srctree
) $(vmlinux-alldirs
))
1151 PHONY
+= $(clean-dirs
) clean archclean
1153 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1155 clean: archclean
$(clean-dirs
)
1158 @find .
$(RCS_FIND_IGNORE
) \
1159 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1160 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
1161 -o
-name
'*.symtypes' -o
-name
'modules.order' \
1162 -o
-name
'Module.markers' -o
-name
'.tmp_*.o.*' \
) \
1163 -type f
-print | xargs
rm -f
1165 # mrproper - Delete all generated files, including .config
1167 mrproper
: rm-dirs
:= $(wildcard $(MRPROPER_DIRS
))
1168 mrproper
: rm-files
:= $(wildcard $(MRPROPER_FILES
))
1169 mrproper-dirs
:= $(addprefix _mrproper_
,Documentation
/DocBook scripts
)
1171 PHONY
+= $(mrproper-dirs
) mrproper archmrproper
1173 $(Q
)$(MAKE
) $(clean)=$(patsubst _mrproper_
%,%,$@
)
1175 mrproper
: clean archmrproper
$(mrproper-dirs
)
1184 @find
$(srctree
) $(RCS_FIND_IGNORE
) \
1185 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
1186 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'.*.orig' \
1187 -o
-name
'.*.rej' -o
-size
0 \
1188 -o
-name
'*%' -o
-name
'.*.cmd' -o
-name
'core' \
) \
1189 -type f
-print | xargs
rm -f
1192 # Packaging of the kernel to various formats
1193 # ---------------------------------------------------------------------------
1194 # rpm target kept for backward compatibility
1195 package-dir
:= $(srctree
)/scripts
/package
1197 %pkg
: include/config
/kernel.release FORCE
1198 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1199 rpm
: include/config
/kernel.release FORCE
1200 $(Q
)$(MAKE
) $(build
)=$(package-dir
) $@
1203 # Brief documentation of the typical targets used
1204 # ---------------------------------------------------------------------------
1206 boards
:= $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*_defconfig
)
1207 boards
:= $(notdir $(boards
))
1208 board-dirs
:= $(dir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/*/*_defconfig
))
1209 board-dirs
:= $(sort $(notdir $(board-dirs
:/=)))
1212 @echo
'Cleaning targets:'
1213 @echo
' clean - Remove most generated files but keep the config and'
1214 @echo
' enough build support to build external modules'
1215 @echo
' mrproper - Remove all generated files + config + various backup files'
1216 @echo
' distclean - mrproper + remove editor backup and patch files'
1218 @echo
'Configuration targets:'
1219 @
$(MAKE
) -f
$(srctree
)/scripts
/kconfig
/Makefile help
1221 @echo
'Other generic targets:'
1222 @echo
' all - Build all targets marked with [*]'
1223 @echo
'* vmlinux - Build the bare kernel'
1224 @echo
'* modules - Build all modules'
1225 @echo
' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1226 @echo
' firmware_install- Install all firmware to INSTALL_FW_PATH'
1227 @echo
' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1228 @echo
' dir/ - Build all files in dir and below'
1229 @echo
' dir/file.[ois] - Build specified target only'
1230 @echo
' dir/file.ko - Build module including final link'
1231 @echo
' prepare - Set up for building external modules'
1232 @echo
' tags/TAGS - Generate tags file for editors'
1233 @echo
' cscope - Generate cscope index'
1234 @echo
' kernelrelease - Output the release version string'
1235 @echo
' kernelversion - Output the version stored in Makefile'
1236 @echo
' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1237 echo
' (default: $(INSTALL_HDR_PATH))'; \
1239 @echo
'Static analysers'
1240 @echo
' checkstack - Generate a list of stack hogs'
1241 @echo
' namespacecheck - Name space analysis on compiled kernel'
1242 @echo
' versioncheck - Sanity check on version.h usage'
1243 @echo
' includecheck - Check for duplicate included header files'
1244 @echo
' export_report - List the usages of all exported symbols'
1245 @echo
' headers_check - Sanity check on exported headers'; \
1247 @echo
'Kernel packaging:'
1248 @
$(MAKE
) $(build
)=$(package-dir
) help
1250 @echo
'Documentation targets:'
1251 @
$(MAKE
) -f
$(srctree
)/Documentation
/DocBook
/Makefile dochelp
1253 @echo
'Architecture specific targets ($(SRCARCH)):'
1254 @
$(if
$(archhelp
),$(archhelp
),\
1255 echo
' No architecture specific help defined for $(SRCARCH)')
1258 $(foreach b
, $(boards
), \
1259 printf
" %-24s - Build for %s\\n" $(b
) $(subst _defconfig
,,$(b
));) \
1261 @
$(if
$(board-dirs
), \
1262 $(foreach b
, $(board-dirs
), \
1263 printf
" %-16s - Show %s-specific targets\\n" help-
$(b
) $(b
);) \
1264 printf
" %-16s - Show all of the above\\n" help-boards
; \
1267 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1268 @echo
' make V=2 [targets] 2 => give reason for rebuild of target'
1269 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
1270 @echo
' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1271 @echo
' make C=2 [targets] Force check of all c source with $$CHECK'
1273 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
1274 @echo
'For further info see the ./README file'
1277 help-board-dirs
:= $(addprefix help-
,$(board-dirs
))
1279 help-boards
: $(help-board-dirs
)
1281 boards-per-dir
= $(notdir $(wildcard $(srctree
)/arch
/$(SRCARCH
)/configs
/$*/*_defconfig
))
1283 $(help-board-dirs
): help-
%:
1284 @echo
'Architecture specific targets ($(SRCARCH) $*):'
1285 @
$(if
$(boards-per-dir
), \
1286 $(foreach b
, $(boards-per-dir
), \
1287 printf
" %-24s - Build for %s\\n" $*/$(b
) $(subst _defconfig
,,$(b
));) \
1291 # Documentation targets
1292 # ---------------------------------------------------------------------------
1293 %docs
: scripts_basic FORCE
1294 $(Q
)$(MAKE
) $(build
)=Documentation
/DocBook
$@
1296 else # KBUILD_EXTMOD
1299 # External module support.
1300 # When building external modules the kernel used as basis is considered
1301 # read-only, and no consistency checks are made and the make
1302 # system is not used on the basis kernel. If updates are required
1303 # in the basis kernel ordinary make commands (without M=...) must
1306 # The following are the only valid targets when building external
1308 # make M=dir clean Delete all automatically generated files
1309 # make M=dir modules Make all modules in specified dir
1310 # make M=dir Same as 'make M=dir modules'
1311 # make M=dir modules_install
1312 # Install the modules built in the module directory
1313 # Assumes install directory is already created
1315 # We are always building modules
1317 PHONY
+= crmodverdir
1321 PHONY
+= $(objtree
)/Module.symvers
1322 $(objtree
)/Module.symvers
:
1323 @
test -e
$(objtree
)/Module.symvers ||
( \
1325 echo
" WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1326 echo
" is missing; modules will have no dependencies and modversions."; \
1329 module-dirs
:= $(addprefix _module_
,$(KBUILD_EXTMOD
))
1330 PHONY
+= $(module-dirs
) modules
1331 $(module-dirs
): crmodverdir
$(objtree
)/Module.symvers
1332 $(Q
)$(MAKE
) $(build
)=$(patsubst _module_
%,%,$@
)
1334 modules
: $(module-dirs
)
1335 @echo
' Building modules, stage 2.';
1336 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1338 PHONY
+= modules_install
1339 modules_install
: _emodinst_ _emodinst_post
1341 install-dir
:= $(if
$(INSTALL_MOD_DIR
),$(INSTALL_MOD_DIR
),extra
)
1344 $(Q
)mkdir
-p
$(MODLIB
)/$(install-dir
)
1345 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modinst
1347 PHONY
+= _emodinst_post
1348 _emodinst_post
: _emodinst_
1351 clean-dirs
:= $(addprefix _clean_
,$(KBUILD_EXTMOD
))
1353 PHONY
+= $(clean-dirs
) clean
1355 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
1357 clean: rm-dirs
:= $(MODVERDIR
)
1358 clean: rm-files
:= $(KBUILD_EXTMOD
)/Module.symvers
1359 clean: $(clean-dirs
)
1362 @find
$(KBUILD_EXTMOD
) $(RCS_FIND_IGNORE
) \
1363 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
1364 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
) \
1365 -type f
-print | xargs
rm -f
1368 @echo
' Building external modules.'
1369 @echo
' Syntax: make -C path/to/kernel/src M=$$PWD target'
1371 @echo
' modules - default target, build the module(s)'
1372 @echo
' modules_install - install the module'
1373 @echo
' clean - remove generated files in module directory only'
1377 PHONY
+= prepare scripts
1380 endif # KBUILD_EXTMOD
1382 # Generate tags for editors
1383 # ---------------------------------------------------------------------------
1385 #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
1386 #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
1387 #Adding $(srctree) adds about 20M on i386 to the size of the output file!
1389 ifeq ($(src
),$(obj
))
1392 __srctree
= $(srctree
)/
1395 ifeq ($(ALLSOURCE_ARCHS
),)
1397 ALLINCLUDE_ARCHS
:= $(ARCH
) $(SUBARCH
)
1399 ALLINCLUDE_ARCHS
:= $(SRCARCH
)
1402 #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
1403 ALLINCLUDE_ARCHS
:= $(ALLSOURCE_ARCHS
)
1406 ALLSOURCE_ARCHS
:= $(SRCARCH
)
1409 ( for arch in
$(ALLSOURCE_ARCHS
) ; do \
1410 find
$(__srctree
)arch
/$${arch} $(RCS_FIND_IGNORE
) \
1413 find
$(__srctree
)security
/selinux
/include $(RCS_FIND_IGNORE
) \
1415 find
$(__srctree
)include $(RCS_FIND_IGNORE
) \
1416 \
( -name config
-o
-name
'asm-*' \
) -prune \
1417 -o
-name
$1 -print; \
1418 for arch in
$(ALLINCLUDE_ARCHS
) ; do \
1419 find
$(__srctree
)include/asm-
$${arch} $(RCS_FIND_IGNORE
) \
1422 find
$(__srctree
)include/asm-generic
$(RCS_FIND_IGNORE
) \
1424 find
$(__srctree
) $(RCS_FIND_IGNORE
) \
1425 \
( -name
include -o
-name arch
-o
-name
'.tmp_*' \
) -prune
-o \
1431 $(call find-sources
,'*.[chS]')
1434 $(call find-sources
,'Kconfig*')
1436 define all-defconfigs
1437 $(call find-sources
,'defconfig')
1441 if
$1 --version
2>&1 | grep
-iq exuberant
; then \
1442 $(all-sources
) | xargs
$1 -a \
1443 -I __initdata
,__exitdata
,__acquires
,__releases \
1444 -I __read_mostly
,____cacheline_aligned
,____cacheline_aligned_in_smp
,____cacheline_internodealigned_in_smp \
1445 -I EXPORT_SYMBOL
,EXPORT_SYMBOL_GPL \
1446 --extra
=+f
--c-kinds
=+px \
1447 --regex-asm
='/^ENTRY\(([^)]*)\).*/\1/'; \
1448 $(all-kconfigs
) | xargs
$1 -a \
1450 --language-force
=kconfig \
1451 --regex-kconfig
='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/\2/'; \
1452 $(all-defconfigs
) | xargs
-r
$1 -a \
1453 --langdef
=dotconfig \
1454 --language-force
=dotconfig \
1455 --regex-dotconfig
='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
1456 elif
$1 --version
2>&1 | grep
-iq emacs
; then \
1457 $(all-sources
) | xargs
$1 -a
; \
1458 $(all-kconfigs
) | xargs
$1 -a \
1459 --regex
='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'; \
1460 $(all-defconfigs
) | xargs
-r
$1 -a \
1461 --regex
='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
1463 $(all-sources
) | xargs
$1 -a
; \
1467 quiet_cmd_cscope-file
= FILELST cscope.files
1468 cmd_cscope-file
= (echo \
-k
; echo \
-q
; $(all-sources
)) > cscope.files
1470 quiet_cmd_cscope
= MAKE cscope.out
1471 cmd_cscope
= cscope
-b
1474 $(call cmd
,cscope-file
)
1477 quiet_cmd_TAGS
= MAKE
$@
1486 quiet_cmd_tags
= MAKE
$@
1496 # Scripts to check various things for consistency
1497 # ---------------------------------------------------------------------------
1500 find
* $(RCS_FIND_IGNORE
) \
1501 -name
'*.[hcS]' -type f
-print |
sort \
1502 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkincludes.pl
1505 find
* $(RCS_FIND_IGNORE
) \
1506 -name
'*.[hcS]' -type f
-print |
sort \
1507 | xargs
$(PERL
) -w
$(srctree
)/scripts
/checkversion.pl
1510 $(PERL
) $(srctree
)/scripts
/namespace.pl
1513 $(PERL
) $(srctree
)/scripts
/export_report.pl
1515 endif #ifeq ($(config-targets),1)
1516 endif #ifeq ($(mixed-targets),1)
1518 PHONY
+= checkstack kernelrelease kernelversion
1520 # UML needs a little special treatment here. It wants to use the host
1521 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1522 # else wants $(ARCH), including people doing cross-builds, which means
1523 # that $(SUBARCH) doesn't work here.
1525 CHECKSTACK_ARCH
:= $(SUBARCH
)
1527 CHECKSTACK_ARCH
:= $(ARCH
)
1530 $(OBJDUMP
) -d vmlinux
$$(find .
-name
'*.ko') | \
1531 $(PERL
) $(src
)/scripts
/checkstack.pl
$(CHECKSTACK_ARCH
)
1534 $(if
$(wildcard include/config
/kernel.release
), $(Q
)echo
$(KERNELRELEASE
), \
1535 $(error kernelrelease not valid
- run
'make prepare' to update it
))
1537 @echo
$(KERNELVERSION
)
1540 # ---------------------------------------------------------------------------
1541 # Single targets are compatible with:
1542 # - build with mixed source and output
1543 # - build with separate output dir 'make O=...'
1544 # - external modules
1546 # target-dir => where to store outputfile
1547 # build-dir => directory in kernel source tree to use
1549 ifeq ($(KBUILD_EXTMOD
),)
1550 build-dir
= $(patsubst %/,%,$(dir $@
))
1551 target-dir
= $(dir $@
)
1553 zap-slash
=$(filter-out .
,$(patsubst %/,%,$(dir $@
)))
1554 build-dir
= $(KBUILD_EXTMOD
)$(if
$(zap-slash
),/$(zap-slash
))
1555 target-dir
= $(if
$(KBUILD_EXTMOD
),$(dir $<),$(dir $@
))
1558 %.s
: %.c prepare scripts FORCE
1559 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1560 %.i
: %.c prepare scripts FORCE
1561 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1562 %.o
: %.c prepare scripts FORCE
1563 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1564 %.lst
: %.c prepare scripts FORCE
1565 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1566 %.s
: %.S prepare scripts FORCE
1567 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1568 %.o
: %.S prepare scripts FORCE
1569 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1570 %.symtypes
: %.c prepare scripts FORCE
1571 $(Q
)$(MAKE
) $(build
)=$(build-dir
) $(target-dir
)$(notdir $@
)
1574 / %/: prepare scripts FORCE
1576 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1577 $(build
)=$(build-dir
)
1578 %.ko
: prepare scripts FORCE
1580 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) \
1581 $(build
)=$(build-dir
) $(@
:.ko
=.o
)
1582 $(Q
)$(MAKE
) -f
$(srctree
)/scripts
/Makefile.modpost
1584 # FIXME Should go into a make.lib or something
1585 # ===========================================================================
1587 quiet_cmd_rmdirs
= $(if
$(wildcard $(rm-dirs
)),CLEAN
$(wildcard $(rm-dirs
)))
1588 cmd_rmdirs
= rm -rf
$(rm-dirs
)
1590 quiet_cmd_rmfiles
= $(if
$(wildcard $(rm-files
)),CLEAN
$(wildcard $(rm-files
)))
1591 cmd_rmfiles
= rm -f
$(rm-files
)
1593 # Run depmod only if we have System.map and depmod is executable
1594 quiet_cmd_depmod
= DEPMOD
$(KERNELRELEASE
)
1596 if
[ -r System.map
-a
-x
$(DEPMOD
) ]; then \
1597 $(DEPMOD
) -ae
-F System.map \
1598 $(if
$(strip $(INSTALL_MOD_PATH
)), -b
$(INSTALL_MOD_PATH
) -r
) \
1602 # Create temporary dir for module support files
1603 # clean it up only when building all modules
1604 cmd_crmodverdir
= $(Q
)mkdir
-p
$(MODVERDIR
) \
1605 $(if
$(KBUILD_MODULES
),; rm -f
$(MODVERDIR
)/*)
1607 a_flags
= -Wp
,-MD
,$(depfile
) $(KBUILD_AFLAGS
) $(AFLAGS_KERNEL
) \
1608 $(NOSTDINC_FLAGS
) $(KBUILD_CPPFLAGS
) \
1609 $(modkern_aflags
) $(EXTRA_AFLAGS
) $(AFLAGS_
$(basetarget
).o
)
1611 quiet_cmd_as_o_S
= AS
$@
1612 cmd_as_o_S
= $(CC
) $(a_flags
) -c
-o
$@
$<
1614 # read all saved command lines
1616 targets
:= $(wildcard $(sort $(targets
)))
1617 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
1619 ifneq ($(cmd_files
),)
1620 $(cmd_files
): ; # Do not try to update included dependency files
1621 include $(cmd_files
)
1624 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1626 # $(Q)$(MAKE) $(clean)=dir
1627 clean := -f
$(if
$(KBUILD_SRC
),$(srctree
)/)scripts
/Makefile.
clean obj
1629 endif # skip-makefile
1634 # Declare the contents of the .PHONY variable as phony. We keep that
1635 # information in a variable se we can use it in if_changed and friends.