7 # To see a list of typical targets execute "make help"
8 # More info can be located in ./README
9 # Comments in this file are targeted only to the developer, do not
10 # expect to learn how to build the kernel reading this file.
12 # Do not print "Entering directory ..."
13 MAKEFLAGS
+= --no-print-directory
15 # We are using a recursive build, so we need to do a little thinking
16 # to get the ordering right.
18 # Most importantly: sub-Makefiles should only ever modify files in
19 # their own directory. If in some directory we have a dependency on
20 # a file in another dir (which doesn't happen often, but it's of
21 # unavoidable when linking the built-in.o targets which finally
22 # turn into vmlinux), we will call a sub make in that other dir, and
23 # after that we are sure that everything which is in that other dir
26 # The only cases where we need to modify files which have global
27 # effects are thus separated out and done before the recursive
28 # descending is started. They are now explicitly listed as the
31 # To put more focus on warnings, be less verbose as default
32 # Use 'make V=1' to see the full commands
35 ifeq ("$(origin V)", "command line")
43 # Call sparse as part of compilation of C files
44 # Use 'make C=1' to enable sparse checking
47 ifeq ("$(origin C)", "command line")
48 KBUILD_CHECKSRC
= $(C
)
51 ifndef KBUILD_CHECKSRC
55 # kbuild supports saving output files in a separate directory.
56 # To locate output files in a separate directory two syntax'es are supported.
57 # In both cases the working directory must be the root of the kernel src.
59 # Use "make O=dir/to/store/output/files/"
61 # 2) Set KBUILD_OUTPUT
62 # Set the environment variable KBUILD_OUTPUT to point to the directory
63 # where the output files shall be placed.
64 # export KBUILD_OUTPUT=dir/to/store/output/files/
67 # The O= assigment takes precedence over the KBUILD_OUTPUT environment variable.
70 # KBUILD_SRC is set on invocation of make in OBJ directory
71 # KBUILD_SRC is not intended to be used by the regular user (for now)
74 # OK, Make called in directory where kernel src resides
75 # Do we want to locate output files in a separate directory?
77 ifeq ("$(origin O)", "command line")
82 ifneq ($(KBUILD_OUTPUT
),)
83 # Invoke a second make in the output directory, passing relevant variables
84 KBUILD_OUTPUT
:= $(shell cd
$(KBUILD_OUTPUT
); /bin
/pwd
)
86 .PHONY
: $(MAKECMDGOALS
) all
89 $(if
$(KBUILD_VERBOSE
:1=),@
)$(MAKE
) -C
$(KBUILD_OUTPUT
) \
90 KBUILD_SRC
=$(CURDIR
) KBUILD_VERBOSE
=$(KBUILD_VERBOSE
) \
91 KBUILD_CHECK
=$(KBUILD_CHECK
) -f
$(CURDIR
)/Makefile
$(MAKECMDGOALS
)
93 # Leave processing to above invocation of make
95 endif # ifneq ($(KBUILD_OUTPUT),)
96 endif # ifeq ($(KBUILD_SRC),)
98 # We process the rest of the Makefile if this is the final invocation of make
99 ifeq ($(skip-makefile
),)
101 srctree
:= $(if
$(KBUILD_SRC
),$(KBUILD_SRC
),$(CURDIR
))
103 # FIXME - TOPDIR is obsolete, use srctree/objtree
110 export srctree objtree VPATH TOPDIR
112 KERNELRELEASE
=$(VERSION
).
$(PATCHLEVEL
).
$(SUBLEVEL
)$(EXTRAVERSION
)
114 # SUBARCH tells the usermode build what the underlying arch is. That is set
115 # first, and if a usermode build is happening, the "ARCH=um" on the command
116 # line overrides the setting of ARCH below. If a native build is happening,
117 # then ARCH is assigned, getting whatever value it gets normally, and
118 # SUBARCH is subsequently ignored.
120 SUBARCH
:= $(shell uname
-m | sed
-e s
/i
.86/i386
/ -e s
/sun4u
/sparc64
/ \
121 -e s
/arm.
*/arm
/ -e s
/sa110
/arm
/ \
122 -e s
/s390x
/s390
/ -e s
/parisc64
/parisc
/ )
124 # Cross compiling and selecting different set of gcc/bin-utils
125 # ---------------------------------------------------------------------------
127 # When performing cross compilation for other architectures ARCH shall be set
128 # to the target architecture. (See arch/* for the possibilities).
129 # ARCH can be set during invocation of make:
131 # Another way is to have ARCH set in the environment.
132 # The default ARCH is the host where make is executed.
134 # CROSS_COMPILE specify the prefix used for all executables used
135 # during compilation. Only gcc and related bin-utils executables
136 # are prefixed with $(CROSS_COMPILE).
137 # CROSS_COMPILE can be set on the command line
138 # make CROSS_COMPILE=ia64-linux-
139 # Alternatively CROSS_COMPILE can be set in the environment.
140 # Default value for CROSS_COMPILE is not to prefix executables
141 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
146 # Architecture as present in compile.h
147 UTS_MACHINE
:= $(ARCH
)
149 # SHELL used by kbuild
150 CONFIG_SHELL
:= $(shell if
[ -x
"$$BASH" ]; then echo
$$BASH; \
151 else if
[ -x
/bin
/bash
]; then echo
/bin
/bash
; \
152 else echo sh
; fi
; fi
)
156 HOSTCFLAGS
= -Wall
-Wstrict-prototypes
-O2
-fomit-frame-pointer
160 # That's our default target when none is given on the command line
161 # Note that 'modules' will be added as a prerequisite as well,
162 # in the CONFIG_MODULES part below
166 # Decide whether to build built-in, modular, or both.
167 # Normally, just do built-in.
172 # If we have only "make modules", don't compile built-in objects.
173 # When we're building modules with modversions, we need to consider
174 # the built-in objects during the descend as well, in order to
175 # make sure the checksums are uptodate before we record them.
177 ifeq ($(MAKECMDGOALS
),modules
)
178 KBUILD_BUILTIN
:= $(if
$(CONFIG_MODVERSIONS
),1)
181 # If we have "make <whatever> modules", compile modules
182 # in addition to whatever we do anyway.
183 # Just "make" or "make all" shall build modules as well
185 ifneq ($(filter all modules
,$(MAKECMDGOALS
)),)
189 ifeq ($(MAKECMDGOALS
),)
193 export KBUILD_MODULES KBUILD_BUILTIN KBUILD_VERBOSE
194 export KBUILD_CHECKSRC KBUILD_SRC
197 # ---------------------------------------------------------------------------
199 # Normally, we echo the whole command before executing it. By making
200 # that echo $($(quiet)$(cmd)), we now have the possibility to set
201 # $(quiet) to choose other forms of output instead, e.g.
203 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
204 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
206 # If $(quiet) is empty, the whole command will be printed.
207 # If it is set to "quiet_", only the short version will be printed.
208 # If it is set to "silent_", nothing wil be printed at all, since
209 # the variable $(silent_cmd_cc_o_c) doesn't exist.
211 # A simple variant is to prefix commands with $(Q) - that's usefull
212 # for commands that shall be hidden in non-verbose mode.
216 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
217 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
219 ifeq ($(KBUILD_VERBOSE
),1)
227 # If the user is running make -s (silent mode), suppress echoing of
230 ifneq ($(findstring s
,$(MAKEFLAGS
)),)
234 check_gcc
= $(shell if
$(CC
) $(CFLAGS
) $(1) -S
-o
/dev
/null
-xc
/dev
/null
> /dev
/null
2>&1; then echo
"$(1)"; else echo
"$(2)"; fi
;)
236 export quiet Q KBUILD_VERBOSE check_gcc
238 # Look for make include files relative to root of kernel src
239 MAKEFLAGS
+= --include-dir
=$(srctree
)
241 # For maximum performance (+ possibly random breakage, uncomment
246 # Make variables (CC, etc...)
248 AS
= $(CROSS_COMPILE
)as
249 LD
= $(CROSS_COMPILE
)ld
250 CC
= $(CROSS_COMPILE
)gcc
252 AR
= $(CROSS_COMPILE
)ar
253 NM
= $(CROSS_COMPILE
)nm
254 STRIP
= $(CROSS_COMPILE
)strip
255 OBJCOPY
= $(CROSS_COMPILE
)objcopy
256 OBJDUMP
= $(CROSS_COMPILE
)objdump
258 RPM
:= $(shell if
[ -x
"/usr/bin/rpmbuild" ]; then echo rpmbuild
; \
260 GENKSYMS
= scripts
/genksyms
/genksyms
261 DEPMOD
= /sbin
/depmod
262 KALLSYMS
= scripts
/kallsyms
266 CFLAGS_MODULE
= $(MODFLAGS
)
267 AFLAGS_MODULE
= $(MODFLAGS
)
272 NOSTDINC_FLAGS
= -nostdinc
-iwithprefix
include
274 CPPFLAGS
:= -D__KERNEL__
-Iinclude \
275 $(if
$(KBUILD_SRC
),-Iinclude2
-I
$(srctree
)/include)
277 CFLAGS
:= -Wall
-Wstrict-prototypes
-Wno-trigraphs
-O2 \
278 -fno-strict-aliasing
-fno-common
279 AFLAGS
:= -D__ASSEMBLY__
281 export VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION KERNELRELEASE ARCH \
282 CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
283 CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
284 HOSTCXX HOSTCXXFLAGS LDFLAGS_BLOB LDFLAGS_MODULE CHECK
286 export CPPFLAGS NOSTDINC_FLAGS OBJCOPYFLAGS LDFLAGS
287 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
288 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
290 export MODVERDIR
:= .tmp_versions
292 # The temporary file to save gcc -MD generated dependencies must not
295 depfile
= $(subst $(comma
),_
,$(@D
)/.
$(@F
).d
)
297 # Files to ignore in find ... statements
299 RCS_FIND_IGNORE
:= \
( -name SCCS
-o
-name BitKeeper
-o
-name .svn
-o
-name CVS \
) -prune
-o
300 RCS_TAR_IGNORE
:= --exclude SCCS
--exclude BitKeeper
--exclude .svn
--exclude CVS
302 # ===========================================================================
303 # Rules shared between *config targets and build targets
305 # Helpers built in scripts/
307 scripts
/docproc scripts
/split-include
: scripts
;
309 .PHONY
: scripts scripts
/fixdep
311 $(Q
)$(MAKE
) $(build
)=scripts
314 $(Q
)$(MAKE
) $(build
)=scripts
$@
317 # To make sure we do not include .config for any of the *config targets
318 # catch them early, and hand them over to scripts/kconfig/Makefile
319 # It is allowed to specify more targets when calling make, including
320 # mixing *config targets and build targets.
321 # For example 'make oldconfig all'.
322 # Detect when mixed targets is specified, and make a second invocation
323 # of make so .config is not included in this case either (for *config).
325 no-dot-config-targets
:= clean mrproper
distclean \
326 cscope TAGS
tags help
%docs
check%
332 ifneq ($(filter $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
333 ifeq ($(filter-out $(no-dot-config-targets
), $(MAKECMDGOALS
)),)
338 ifneq ($(filter config
%config
,$(MAKECMDGOALS
)),)
340 ifneq ($(filter-out config
%config
,$(MAKECMDGOALS
)),)
345 ifeq ($(mixed-targets
),1)
346 # ===========================================================================
347 # We're called with mixed targets (*config and build targets).
348 # Handle them one by one.
351 $(Q
)$(MAKE
) -C
$(srctree
) KBUILD_SRC
= $@
354 ifeq ($(config-targets
),1)
355 # ===========================================================================
356 # *config targets only - make sure prerequisites are updated, and descend
357 # in scripts/kconfig to make the *config target
359 %config
: scripts
/fixdep FORCE
360 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
361 config
: scripts
/fixdep FORCE
362 $(Q
)$(MAKE
) $(build
)=scripts
/kconfig
$@
365 # ===========================================================================
366 # Build targets only - this includes vmlinux, arch specific targets, clean
367 # targets and others. In general all targets except *config targets.
369 # Objects we will link into vmlinux / subdirs we need to visit
371 drivers-y
:= drivers
/ sound
/
377 ifeq ($(dot-config
),1)
378 # In this section, we need .config
380 # Read in dependencies to all Kconfig* files, make sure to run
381 # oldconfig if changes are detected.
386 # If .config needs to be updated, it will be done via the dependency
387 # that autoconf has on .config.
388 # To avoid any implicit rule to kick in, define an empty command
391 # If .config is newer than include/linux/autoconf.h, someone tinkered
392 # with it and forgot to run make oldconfig
393 include/linux
/autoconf.h
: .config
394 $(Q
)$(MAKE
) -f
$(srctree
)/Makefile silentoldconfig
398 include $(srctree
)/arch
/$(ARCH
)/Makefile
400 # Let architecture Makefiles change CPPFLAGS if needed
401 CFLAGS
:= $(CPPFLAGS
) $(CFLAGS
)
402 AFLAGS
:= $(CPPFLAGS
) $(AFLAGS
)
404 core-y
+= kernel
/ mm
/ fs
/ ipc
/ security
/ crypto
/
406 SUBDIRS
+= $(patsubst %/,%,$(filter %/, $(init-y
) $(init-m
) \
407 $(core-y
) $(core-m
) $(drivers-y
) $(drivers-m
) \
408 $(net-y
) $(net-m
) $(libs-y
) $(libs-m
)))
410 ALL_SUBDIRS
:= $(sort $(SUBDIRS
) $(patsubst %/,%,$(filter %/, \
412 $(core-n
) $(core-
) $(drivers-n
) $(drivers-
) \
413 $(net-n
) $(net-
) $(libs-n
) $(libs-
))))
415 init-y
:= $(patsubst %/, %/built-in.o
, $(init-y
))
416 core-y
:= $(patsubst %/, %/built-in.o
, $(core-y
))
417 drivers-y
:= $(patsubst %/, %/built-in.o
, $(drivers-y
))
418 net-y
:= $(patsubst %/, %/built-in.o
, $(net-y
))
419 libs-y1
:= $(patsubst %/, %/lib.a
, $(libs-y
))
420 libs-y2
:= $(patsubst %/, %/built-in.o
, $(libs-y
))
421 libs-y
:= $(libs-y1
) $(libs-y2
)
423 # Here goes the main Makefile
424 # ---------------------------------------------------------------------------
427 ifndef CONFIG_FRAME_POINTER
428 CFLAGS
+= -fomit-frame-pointer
431 ifdef CONFIG_DEBUG_INFO
435 # warn about C99 declaration after statement
436 CFLAGS
+= $(call check_gcc
,-Wdeclaration-after-statement
,)
439 # INSTALL_PATH specifies where to place the updated kernel and system map
440 # images. Uncomment if you want to place them anywhere other than root.
443 #export INSTALL_PATH=/boot
446 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
447 # relocations required by build roots. This is not defined in the
448 # makefile but the arguement can be passed to make if needed.
451 MODLIB
:= $(INSTALL_MOD_PATH
)/lib
/modules
/$(KERNELRELEASE
)
455 # ---------------------------------------------------------------------------
457 # This is a bit tricky: If we need to relink vmlinux, we want
458 # the version number incremented, which means recompile init/version.o
459 # and relink init/init.o. However, we cannot do this during the
460 # normal descending-into-subdirs phase, since at that time
461 # we cannot yet know if we will need to relink vmlinux.
462 # So we descend into init/ inside the rule for vmlinux again.
464 vmlinux-objs
:= $(head-y
) $(init-y
) $(core-y
) $(libs-y
) $(drivers-y
) $(net-y
)
466 quiet_cmd_vmlinux__
= LD
$@
468 $(LD
) $(LDFLAGS
) $(LDFLAGS_vmlinux
) $(head-y
) $(init-y
) \
475 $(filter .tmp_kallsyms
%,$^
) \
479 # set -e makes the rule exit immediately on error
481 define rule_vmlinux__
483 $(if
$(filter .tmp_kallsyms
%,$^
),, \
484 echo
' GEN .version'; \
485 .
$(srctree
)/scripts
/mkversion
> .tmp_version
; \
486 mv
-f .tmp_version .version
; \
487 $(MAKE
) $(build
)=init
; \
489 $(if
$($(quiet
)cmd_vmlinux__
), \
490 echo
' $($(quiet)cmd_vmlinux__)' &&) \
492 echo
'cmd_$@ := $(cmd_vmlinux__)' > $(@D
)/.
$(@F
).cmd
497 $(NM
) $@ | grep
-v
'\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' |
sort > System.map
500 LDFLAGS_vmlinux
+= -T arch
/$(ARCH
)/kernel
/vmlinux.lds.s
502 # Generate section listing all symbols and add it into vmlinux
503 # It's a three stage process:
504 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
506 # Running kallsyms on that gives us .tmp_kallsyms1.o with
508 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
509 # but due to the added section, some addresses have shifted
510 # From here, we generate a correct .tmp_kallsyms2.o
511 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
513 ifdef CONFIG_KALLSYMS
515 kallsyms.o
:= .tmp_kallsyms2.o
517 quiet_cmd_kallsyms
= KSYM
$@
518 cmd_kallsyms
= $(NM
) -n
$< |
$(KALLSYMS
) > $@
520 .tmp_kallsyms1.o .tmp_kallsyms2.o
: %.o
: %.S scripts FORCE
521 $(call if_changed_dep
,as_o_S
)
523 .tmp_kallsyms
%.S
: .tmp_vmlinux
%
526 .tmp_vmlinux1
: $(vmlinux-objs
) arch
/$(ARCH
)/kernel
/vmlinux.lds.s FORCE
527 +$(call if_changed_rule
,vmlinux__
)
529 .tmp_vmlinux2
: $(vmlinux-objs
) .tmp_kallsyms1.o arch
/$(ARCH
)/kernel
/vmlinux.lds.s FORCE
530 $(call if_changed_rule
,vmlinux__
)
534 # Finally the vmlinux rule
536 vmlinux
: $(vmlinux-objs
) $(kallsyms.o
) arch
/$(ARCH
)/kernel
/vmlinux.lds.s FORCE
537 $(call if_changed_rule
,vmlinux
)
539 # The actual objects are generated when descending,
540 # make sure no implicit rule kicks in
542 $(sort $(vmlinux-objs
)) arch
/$(ARCH
)/kernel
/vmlinux.lds.s
: $(SUBDIRS
) ;
544 # Handle descending into subdirectories listed in $(SUBDIRS)
547 $(SUBDIRS
): prepare-all
548 $(Q
)$(MAKE
) $(build
)=$@
550 # Things we need to do before we recursively start building the kernel
551 # or the modules are listed in "prepare-all".
552 # A multi level approach is used. prepare1 is updated first, then prepare0.
553 # prepare-all is the collection point for the prepare targets.
555 .PHONY
: prepare-all prepare prepare0 prepare1
557 # prepare1 is used to check if we are building in a separate output directory,
559 # 1) Check that make has not been executed in the kernel src $(srctree)
560 # 2) Create the include2 directory, used for the second asm symlink
563 ifneq ($(KBUILD_SRC
),)
564 @echo
' Using $(srctree) as source for kernel'
565 $(Q
)if
[ -h
$(srctree
)/include/asm
-o
-f
$(srctree
)/.config
]; then \
566 echo
" $(srctree) is not clean, please run 'make mrproper'";\
567 echo
" in the '$(srctree)' directory.";\
570 $(Q
)if
[ ! -d include2
]; then mkdir
-p include2
; fi
;
571 $(Q
)ln
-fsn
$(srctree
)/include/asm-
$(ARCH
) include2
/asm
574 prepare0
: prepare1
include/linux
/version.h
include/asm
include/config
/MARKER
576 ifeq ($(origin SUBDIRS
),file
)
577 $(Q
)rm -rf
$(MODVERDIR
)
579 @echo
'*** Warning: Overriding SUBDIRS on the command line can cause'
580 @echo
'*** inconsistencies'
583 $(if
$(CONFIG_MODULES
),$(Q
)mkdir
-p
$(MODVERDIR
))
585 # All the preparing..
586 prepare-all
: prepare0 prepare
588 # Leave this as default for preprocessing vmlinux.lds.S, which is now
589 # done in arch/$(ARCH)/kernel/Makefile
591 export AFLAGS_vmlinux.lds.o
+= -P
-C
-U
$(ARCH
)
594 # ---------------------------------------------------------------------------
596 %.s
: %.c scripts FORCE
597 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
598 %.i
: %.c scripts FORCE
599 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
600 %.o
: %.c scripts FORCE
601 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
602 %/: scripts prepare FORCE
603 $(Q
)$(MAKE
) KBUILD_MODULES
=$(if
$(CONFIG_MODULES
),1) $(build
)=$(@D
)
604 %.lst
: %.c scripts FORCE
605 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
606 %.s
: %.S scripts FORCE
607 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
608 %.o
: %.S scripts FORCE
609 $(Q
)$(MAKE
) $(build
)=$(@D
) $@
611 # FIXME: The asm symlink changes when $(ARCH) changes. That's
612 # hard to detect, but I suppose "make mrproper" is a good idea
613 # before switching between archs anyway.
616 @echo
' SYMLINK $@ -> include/asm-$(ARCH)'
617 $(Q
)if
[ ! -d
include ]; then mkdir
-p
include; fi
;
618 @ln
-fsn asm-
$(ARCH
) $@
620 # Split autoconf.h into include/linux/config/*
622 include/config
/MARKER
: scripts
/split-include
include/linux
/autoconf.h
623 @echo
' SPLIT include/linux/autoconf.h -> include/config/*'
624 @scripts
/split-include
include/linux
/autoconf.h
include/config
627 # Generate some files
628 # ---------------------------------------------------------------------------
630 # version.h changes when $(KERNELRELEASE) etc change, as defined in
635 define filechk_version.h
636 if expr length
"$(KERNELRELEASE)" \
> $(uts_len
) >/dev
/null
; then \
637 echo
'"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
640 (echo \
#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
641 echo \
#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
642 echo
'#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
646 include/linux
/version.h
: Makefile
647 $(call filechk
,version.h
)
649 # ---------------------------------------------------------------------------
653 @echo
'*** Warning: make $@ is unnecessary now.'
655 # ---------------------------------------------------------------------------
660 # By default, build modules as well
667 modules
: $(SUBDIRS
) $(if
$(KBUILD_BUILTIN
),vmlinux
)
668 @echo
' Building modules, stage 2.';
669 $(Q
)$(MAKE
) -rR
-f
$(srctree
)/scripts
/Makefile.modpost
673 .PHONY
: modules_install
674 modules_install
: _modinst_ _modinst_post
678 @if
[ -z
"`$(DEPMOD) -V | grep module-init-tools`" ]; then \
679 echo
"Warning: you may need to install module-init-tools"; \
680 echo
"See http://www.codemonkey.org.uk/post-halloween-2.5.txt";\
683 @
rm -rf
$(MODLIB
)/kernel
684 @
rm -f
$(MODLIB
)/build
685 @mkdir
-p
$(MODLIB
)/kernel
686 @ln
-s
$(TOPDIR
) $(MODLIB
)/build
687 $(Q
)$(MAKE
) -rR
-f
$(srctree
)/scripts
/Makefile.modinst
689 # If System.map exists, run depmod. This deliberately does not have a
690 # dependency on System.map since that would run the dependency tree on
691 # vmlinux. This depmod is only for convenience to give the initial
692 # boot a modules.dep even before / is mounted read-write. However the
693 # boot script depmod is the master version.
694 ifeq "$(strip $(INSTALL_MOD_PATH))" ""
697 depmod_opts
:= -b
$(INSTALL_MOD_PATH
) -r
699 .PHONY
: _modinst_post
700 _modinst_post
: _modinst_
701 if
[ -r System.map
]; then
$(DEPMOD
) -ae
-F System.map
$(depmod_opts
) $(KERNELRELEASE
); fi
703 else # CONFIG_MODULES
705 # Modules not configured
706 # ---------------------------------------------------------------------------
708 modules modules_install
: FORCE
710 @echo
"The present kernel configuration has modules disabled."
711 @echo
"Type 'make config' and enable loadable module support."
712 @echo
"Then build a kernel with module support enabled."
716 endif # CONFIG_MODULES
718 # Generate asm-offsets.h
719 # ---------------------------------------------------------------------------
721 define filechk_gen-asm-offsets
723 echo
"#ifndef __ASM_OFFSETS_H__"; \
724 echo
"#define __ASM_OFFSETS_H__"; \
726 echo
" * DO NOT MODIFY."; \
728 echo
" * This file was generated by arch/$(ARCH)/Makefile"; \
732 sed
-ne
"/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
739 # Cleaning is done on three levels.
740 # make clean Delete all automatically generated files, including
741 # tools and firmware.
742 # make mrproper Delete the current configuration, and related files
743 # Any core files spread around are deleted as well
744 # make distclean Remove editor backup files, patch leftover files and the like
746 # Files removed with 'make clean'
747 CLEAN_FILES
+= vmlinux System.map MC
*
749 # Files removed with 'make mrproper'
751 include/linux
/autoconf.h
include/linux
/version.h \
752 .version .config .config.old config.in config.old \
755 .hdepend
include/linux
/modversions.h \
756 tags TAGS cscope.out kernel.spec \
759 # Directories removed with 'make mrproper'
764 include/linux
/modules \
767 # clean - Delete all intermediate files
769 clean-dirs
+= $(addprefix _clean_
,$(ALL_SUBDIRS
) Documentation
/DocBook scripts
)
770 .PHONY
: $(clean-dirs
) clean archclean mrproper archmrproper
distclean
772 $(Q
)$(MAKE
) $(clean)=$(patsubst _clean_
%,%,$@
)
774 quiet_cmd_rmclean
= RM
$$(CLEAN_FILES
)
775 cmd_rmclean
= rm -f
$(CLEAN_FILES
)
776 clean: archclean
$(clean-dirs
)
778 @find .
$(RCS_FIND_IGNORE
) \
779 \
( -name
'*.[oas]' -o
-name
'*.ko' -o
-name
'.*.cmd' \
780 -o
-name
'.*.d' -o
-name
'.*.tmp' -o
-name
'*.mod.c' \
) \
781 -type f
-print | xargs
rm -f
783 # mrproper - delete configuration + modules + core files
785 quiet_cmd_mrproper
= RM
$$(MRPROPER_DIRS
) + $$(MRPROPER_FILES
)
786 cmd_mrproper
= rm -rf
$(MRPROPER_DIRS
) && rm -f
$(MRPROPER_FILES
)
787 mrproper
distclean: clean archmrproper
788 @echo
' Making $@ in the srctree'
789 @find .
$(RCS_FIND_IGNORE
) \
790 \
( -name
'*.orig' -o
-name
'*.rej' -o
-name
'*~' \
791 -o
-name
'*.bak' -o
-name
'#*#' -o
-name
'.*.orig' \
792 -o
-name
'.*.rej' -o
-size
0 \
793 -o
-name
'*%' -o
-name
'.*.cmd' -o
-name
'core' \
) \
794 -type f
-print | xargs
rm -f
797 # Generate tags for editors
798 # ---------------------------------------------------------------------------
801 ( find .
$(RCS_FIND_IGNORE
) \
802 \
( -name
include -o
-name arch \
) -prune
-o \
803 -name
'*.[chS]' -print; \
804 find arch
/$(ARCH
) $(RCS_FIND_IGNORE
) \
805 -name
'*.[chS]' -print; \
806 find
include $(RCS_FIND_IGNORE
) \
807 \
( -name config
-o
-name
'asm-*' \
) -prune \
808 -o
-name
'*.[chS]' -print; \
809 find
include/asm-
$(ARCH
) $(RCS_FIND_IGNORE
) \
810 -name
'*.[chS]' -print; \
811 find
include/asm-generic
$(RCS_FIND_IGNORE
) \
812 -name
'*.[chS]' -print )
815 quiet_cmd_cscope
= MAKE
$@
816 cmd_cscope
= $(all-sources
) | cscope
-k
-b
-i
-
818 quiet_cmd_TAGS
= MAKE
$@
819 cmd_TAGS
= $(all-sources
) | etags
-
821 # Exuberant ctags works better with -I
823 quiet_cmd_tags
= MAKE
$@
826 CTAGSF
=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_NOVERS"`; \
827 $(all-sources
) | xargs ctags
$$CTAGSF -a
840 # ---------------------------------------------------------------------------
844 # Remove hyphens since they have special meaning in RPM filenames
845 KERNELPATH
=kernel-
$(subst -,,$(KERNELRELEASE
))
847 # If you do a make spec before packing the tarball you can rpm -ta it
850 $(CONFIG_SHELL
) $(srctree
)/scripts
/mkspec
> $(objtree
)/kernel.spec
852 # a) Build a tar ball
853 # b) generate an rpm from it
854 # c) and pack the result
855 # - Use /. to avoid tar packing just the symlink
860 ln
-sf
$(srctree
) $(KERNELPATH
) ; \
861 tar -cvz
$(RCS_TAR_IGNORE
) -f
$(KERNELPATH
).
tar.gz
$(KERNELPATH
)/.
; \
865 $(CONFIG_SHELL
) $(srctree
)/scripts
/mkversion
> $(objtree
)/.tmp_version
;\
866 mv
-f
$(objtree
)/.tmp_version
$(objtree
)/.version
;
868 $(RPM
) -ta ..
/$(KERNELPATH
).
tar.gz
869 rm ..
/$(KERNELPATH
).
tar.gz
871 # Brief documentation of the typical targets used
872 # ---------------------------------------------------------------------------
875 @echo
'Cleaning targets:'
876 @echo
' clean - remove most generated files but keep the config'
877 @echo
' mrproper - remove all generated files + config + various backup files'
879 @echo
'Configuration targets:'
880 @
$(MAKE
) -f scripts
/kconfig
/Makefile help
882 @echo
'Other generic targets:'
883 @echo
' all - Build all targets marked with [*]'
884 @echo
'* vmlinux - Build the bare kernel'
885 @echo
'* modules - Build all modules'
886 @echo
' modules_install - Install all modules'
887 @echo
' dir/ - Build all files in dir and below'
888 @echo
' dir/file.[ois] - Build specified target only'
889 @echo
' rpm - Build a kernel as an RPM package'
890 @echo
' tags/TAGS - Generate tags file for editors'
892 @echo
'Documentation targets:'
893 @
$(MAKE
) -f Documentation
/DocBook
/Makefile dochelp
895 @echo
'Architecture specific targets ($(ARCH)):'
896 @
$(if
$(archhelp
),$(archhelp
),\
897 echo
' No architecture specific help defined for $(ARCH)')
899 @echo
' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
900 @echo
' make O=dir [targets] Locate all output files in "dir", including .config'
901 @echo
' make C=1 [targets] Check all c source with checker tool'
903 @echo
'Execute "make" or "make all" to build all targets marked with [*] '
904 @echo
'For further info see the ./README file'
907 # Documentation targets
908 # ---------------------------------------------------------------------------
909 %docs
: scripts
/docproc FORCE
910 $(Q
)$(MAKE
) $(build
)=Documentation
/DocBook
$@
912 # Scripts to check various things for consistency
913 # ---------------------------------------------------------------------------
916 find
* $(RCS_FIND_IGNORE
) \
917 -name
'*.[hcS]' -type f
-print |
sort \
918 | xargs
$(PERL
) -w scripts
/checkconfig.pl
921 find
* $(RCS_FIND_IGNORE
) \
922 -name
'*.[hcS]' -type f
-print |
sort \
923 | xargs
$(PERL
) -w scripts
/checkincludes.pl
926 find
* $(RCS_FIND_IGNORE
) \
927 -name
'*.[hcS]' -type f
-print |
sort \
928 | xargs
$(PERL
) -w scripts
/checkversion.pl
930 endif #ifeq ($(config-targets),1)
931 endif #ifeq ($(mixed-targets),1)
933 # FIXME Should go into a make.lib or something
934 # ===========================================================================
936 a_flags
= -Wp
,-MD
,$(depfile
) $(AFLAGS
) $(AFLAGS_KERNEL
) \
937 $(NOSTDINC_FLAGS
) $(CPPFLAGS
) \
938 $(modkern_aflags
) $(EXTRA_AFLAGS
) $(AFLAGS_
$(*F
).o
)
940 quiet_cmd_as_o_S
= AS
$@
941 cmd_as_o_S
= $(CC
) $(a_flags
) -c
-o
$@
$<
943 # read all saved command lines
945 targets
:= $(wildcard $(sort $(targets
)))
946 cmd_files
:= $(wildcard .
*.cmd
$(foreach f
,$(targets
),$(dir $(f
)).
$(notdir $(f
)).cmd
))
948 ifneq ($(cmd_files
),)
949 $(cmd_files
): ; # Do not try to update included dependency files
953 # execute the command and also postprocess generated .d dependencies
956 if_changed_dep
= $(if
$(strip $?
$(filter-out FORCE
$(wildcard $^
),$^
)\
957 $(filter-out $(cmd_
$(1)),$(cmd_
$@
))\
958 $(filter-out $(cmd_
$@
),$(cmd_
$(1)))),\
960 $(if
$($(quiet
)cmd_
$(1)),echo
' $(subst ','\'',$($(quiet
)cmd_
$(1)))';) \
962 scripts/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D
)/.
$(@F
).tmp
; \
964 mv
-f
$(@D
)/.
$(@F
).tmp
$(@D
)/.
$(@F
).cmd
)
966 # Usage: $(call if_changed_rule,foo)
967 # will check if $(cmd_foo) changed, or any of the prequisites changed,
968 # and if so will execute $(rule_foo)
970 if_changed_rule
= $(if
$(strip $? \
971 $(filter-out $(cmd_
$(1)),$(cmd_
$(@F
)))\
972 $(filter-out $(cmd_
$(@F
)),$(cmd_
$(1)))),\
975 # If quiet is set, only print short version of command
977 cmd
= @
$(if
$($(quiet
)cmd_
$(1)),echo
' $($(quiet)cmd_$(1))' &&) $(cmd_
$(1))
979 # filechk is used to check if the content of a generated file is updated.
981 # define filechk_sample
982 # echo $KERNELRELEASE
984 # version.h : Makefile
985 # $(call filechk,sample)
986 # The rule defined shall write to stdout the content of the new file.
987 # The existing file will be compared with the new one.
988 # - If no file exist it is created
989 # - If the content differ the new file is used
990 # - If they are equal no change, and no timestamp update
995 mkdir
-p
$(dir $@
); \
996 $(filechk_
$(1)) < $< > $@.tmp
; \
997 if
[ -r
$@
] && cmp
-s
$@
$@.tmp
; then \
1005 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=dir
1007 # $(Q)$(MAKE) $(build)=dir
1008 build
:= -f
$(if
$(KBUILD_SRC
),$(srctree
)/)scripts
/Makefile.build obj
1010 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1012 # $(Q)$(MAKE) $(clean)=dir
1013 clean := -f
$(if
$(KBUILD_SRC
),$(srctree
)/)scripts
/Makefile.
clean obj
1015 # $(call descend,<dir>,<target>)
1016 # Recursively call a sub-make in <dir> with target <target>
1017 # Usage is deprecated, because make does not see this as an invocation of make.
1018 descend
=$(Q
)$(MAKE
) -f
$(if
$(KBUILD_SRC
),$(srctree
)/)scripts
/Makefile.build obj
=$(1) $(2)
1020 endif # skip-makefile